Python Open File

How do you know the file's not open? Even though you're not getting an error, there must be some sort of indication. All organizations big or small, trying to leverage the technology and invent some cool solutions. In the following example, we do just that and then print out the data we got:. Python method open() opens the file file and set various flags according to flags and possibly its mode according to mode. py file? What program do I need to open a. Become a Member Donate to the PSF. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you may use, copy, modify, and distribute in both open and proprietary applications. Learn Data Science from the comfort of your browser, at your own pace with DataCamp's video tutorials & coding challenges on R, Python, Statistics & more. ) when you have a. By default, it returns a list of components instead. first of, its not possible to access samba shares / files through python. readline() returns a byte string). Openpyxl is a Python module to deal with Excel files without involving MS Excel application software. Python Excel Mini Cookbook. Python(x,y) - the scientific Python distribution. A highly efficient way of reading binary data with a known data-type, as well as parsing simply formatted text files. BytesIO or tempfile. addWidget ( btn ) # Connect the clicked signal to the get_fname handler self. The extensions are shown in the bottom of the form (Files of type). To verify the authenticity of the download, grab both files and then run this command: gpg --verify Python-3. Like most languages, file operations can be done with Python. You get an interactive prompt (the REPL) to execute commands immediately, along with the ability to run and import scripts from the built-in filesystem. The library parses JSON into a Python dictionary or list. Check out the pathlib module – made standard in Python 3. py ファイルは無いため、 No such file or directory (そんなファイル無いよ)というエラーになります。対処方法としては以下のいずれかがあります。. You need to either enter the appropriate subdirectory (with cd ) or add it to the filename as you've done in your example. The script will downloads all files and folders under the address provided to the local disk. MIT OpenCourseWare is a free & open publication of material from thousands of MIT courses, covering the entire MIT curriculum. Python Read File, Write File, Open File, Delete File, Copy File Pankaj Leave a Comment In this tutorial we are going to learn about Python File Operations such as python read file, python write file, open file, delete file and copy file. If the file isn't (and won't be) big, just open it, read the whole thing as a string or, better, list of strings with readlines(), then filter it (maybe with a list comprehension and re), then open your output file (or the input file if you want it to be an actual edit) and write. This closes the open direction file, whereupon the system performs the action of setting the direction to "out". Basically there are three steps first get a handle on the file using the open() function, then read the file line by line using either readline() or file iterator and finally use the close() method to close it and free up any system resources. The code below will simply show the dialog and return the filename. In test_notebookc. Una panoramica sul file IO: Aprite un oggetto file con la funzione open; Leggete o scrivete nell'oggetto file (a seconda di come l'avete aperto) Chiudetelo Il primo passo è usare un oggetto file grazie alla funzione open. For now, for choosing the file I've to do this: But it's not very useful because you have to type the path of file by yourself. File Handling File handling in Python requires no importing of modules. Reading and Writing Files in Python (article) - DataCamp. pandas is a NumFOCUS sponsored project. ) pyuic form1. addWidget ( btn ) # Connect the clicked signal to the get_fname handler self. PY file extension. WinPython is a free open-source portable distribution of the Python programming language for Windows XP/7/8, designed for scientists, supporting both 32bit and 64bit versions of Python 2 and Python 3. The easiest way does open another program, but everything is taken care of in the Python code, and doesn't require the user to specify a file to be printed. By using the open() function and a simple loop, you can cycle through a list of file names and assign a variable with a reference to that file, storing it for later use. But the version that you have is quite likely an older version. PYO extension are known as Python Compiled files open with: python. If you need to brush up on this sort of thing, there are any number of introductory pages out there like this one or this one. (Sample code to create the above spreadsheet. (These instructions are geared to GnuPG and Unix command-line users. Opening files for editing To open a file for editing. Two, you say to "just pass" something like "0o644" as the mode. You have put in your raw_input() to open the file e:. Programmers can edit Python scripts with numerous software. To make this run, you’ll need to have the xlwings add-in installed. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you may use, copy, modify, and distribute in both open and proprietary applications. Python has a built-in function open() to open a file. how do you know if open failed?. Programmers can edit Python scripts with numerous software. first of, its not possible to access samba shares / files through python. My file is named test_notebookc. The PYTHON file type is primarily associated with Python by Python Software Foundation. Dropbox Open Source. Overview Reading information from files is a common and important operation in Python. On disk, this project is represented by a. The PC Pitstop File Extension Library can be used to find a program that can open your email attachement or another unkown file type. A solution, represented by a. Python File Open. Select and open the KML file. On the left, click My Places. XlsxWriter is a Python module that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel 2007+ XLSX file. Other times, it means “to open the file in its default program”; and sometimes it means, “open the file in the program I specify”. when using a web application such as Pyramid, Flask or Django then you can simply provide a NamedTemporaryFile() :. 5) to wrap our code for opening a file object, the internals of Python will do something similar to the following code to ensure that no matter what the file object is closed after use. The equipment save the frames as "European data format" files. Ivan Krstić is the director of security architecture at OLPC; pretend you opened this in a desktop text editor (nothing fancy like vi) and you saved it in UTF-8 format. Does anyone know how to open edf files in python? I am looking for the way to manipulate SAXS detector's images as python-arrays. It can also save to a file-like object. Python 内置函数. I would start by confirming that you are putting the module in the correct directory. KDevelop showing code completion for Python files Screenshot. The location of your file is often referred to as the file path. FITS (Flexible Image Transport System) is a portable file standard widely used in the astronomy community to store images and tables. Star Fork IfcOpenShell-python: A python module based on IfcOpenShell Installation instructions for Windows, Linux and Mac OSX. We'll be using Python in the workshop, and it'll save lots of time if, before arriving at the workshop, everyone has this installed and is familiar how to open, edit, and run a script (which is just a text file) using Python. Star Fork IfcOpenShell-python: A python module based on IfcOpenShell Installation instructions for Windows, Linux and Mac OSX. For instance, a faulty application, python27. $\endgroup$ – zeffii Jun 5 '15 at 5:52. Especially if it's technical. There’s plenty of Python modules for doing this on Pypi. The default mode is 0777 (octal), and the current umask value is first masked out. The open() function takes two parameters; filename, and mode. IPython is open source (BSD license), and is used by a range of other projects; add your project to that list if it uses IPython as a library, and please don’t forget to cite the project. KDevelop showing the document switcher for easily switching between open documents (invoked via Ctrl+Tab) Screenshot. This is the easiest way to launch Folder Options without opening the File Explorer. If the file isn't (and won't be) big, just open it, read the whole thing as a string or, better, list of strings with readlines(), then filter it (maybe with a list comprehension and re), then open your output file (or the input file if you want it to be an actual edit) and write. CSV files have been used extensively in e-commerce applications because they are considered very easy to process. readline() where fin is the text file opened for reading. Acknowledgements "YourKit kindly supports PyDev (and other open source projects) with its full-featured Java Profiler. Writing Your First Python Program. It is a good practice to use the close() method to close a file. pandas is an open source, BSD-licensed library providing high-performance, easy-to-use data structures and data analysis tools for the Python programming language. It is used extensively in different operations from data copying to data mining and data analysis by computer operators to data analysts and data. If the file is a. Teams in investment banks, hedge funds, and engineering organizations worldwide are using PyXLL to bring the full power of the Python ecosystem to their Excel end-users. With Python there are several methods which can be used to check if a file exists, in a certain directory. Your saved places will only appear on the device on which you saved them. Python provides the open() method that is used to open a file. Vim does this. dll can arise for a few different different reasons. The sys library connects a Python program to the system it is running on. py file extension. Share or demonstrate solutions to problems. TemporaryFile instance. pandas is a NumFOCUS sponsored project. A solution, represented by a. Read mode is the default mode for files you open in Python. Check out the pathlib module – made standard in Python 3. Python’s with statement was first introduced five years ago, in Python 2. But that’s a topic for. Resources designed to fill key skills gaps as open source industry matures. In this case, the simplest solution is to close the file in Excel! If you want to read data from the live spreadsheet though, you have to call into Excel from Python and get the data you need that way. If you are aware of any additional file formats that use the PYO extension, please let us know. py file STEP-1 : Open the IDLE editor, it should be available in your All Programs (this is for windows), under Python 3. Determine if your copy of Python is 32bit or 64bit. mode (optional) - mode while opening a file. The cgi script runs fine but when I try to open this file, I get a permission error: Traceback (most recent call last): File "/asdf/pkgs/ Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. This is a security measure to prevent HTTP Host hea. If a user presses cancel the filename is empty. Python's built-in open() function has not supported this for 26 years and so there's obviously not that much of a need if this has not consistently come up as a shortcoming. File handling ¶. When reading text files in Python, you get the lines that contain also the final \n. 上記の結果、Pythonをインストールしたディレクトリに mymod. Python on Windows makes a distinction between text and binary files; the end-of-line characters in text files are automatically altered slightly when data is read or written. Find materials for this course in the pages linked along the left. filesize setting in idea. This is a convenient way to create temporary HDF5 files, e. pyproj file in your project folder. Your saved places will only appear on the device on which you saved them. The file data contains comma separated values (csv). py ファイルは無いため、 No such file or directory (そんなファイル無いよ)というエラーになります。対処方法としては以下のいずれかがあります。. Step 1: Type file explorer options in Start menu or taskbar search box, and Press Enter to open File Explorer Options. If your program needs to work through a file, it is usually best to read in the file one line at a time for reasons of memory space and processing speed. Python Tutor (created by Philip Guo) helps people overcome a fundamental barrier to learning programming: understanding what happens as the computer runs each line of code. 7 version:. Python Data File Formats – Python CSV. However, Notepad++ is a better third-party text editor that also supports the PY file format. In most cases, you can do this without any trouble as long as you have. When reading text files in Python, you get the lines that contain also the final \n. Instead of this:. Let’s say you have a data folder that contains a file that you want to open in your Python program: This is the wrong way to code it in Python: Notice that I’ve hardcoded the path using Unix. Python File Open. Note 2: In most programs, using the file object directly leads to clearer code. Resources designed to fill key skills gaps as open source industry matures. While Microsoft made it easier to discover this command, it only offers the Password to Open, not the Password to Modify. mode (optional) - mode while opening a file. So the context is this; a zip file is uploaded into a web service and Python then needs extract that and analyze and deal with each file within. 5’s new with statement (dead link) seems to be a bit confusing even for experienced Python programmers. In our first example we want to show how to read data from a file. EXE instead of PYTHON. Determine if your copy of Python is 32bit or 64bit. py files to another format?. Dropbox Open Source. We'll be using Python in the workshop, and it'll save lots of time if, before arriving at the workshop, everyone has this installed and is familiar how to open, edit, and run a script (which is just a text file) using Python. Step 1: Open File Explorer or Quick Access using Windows + E keyboard shortcut. Openpyxl is a Python module to deal with Excel files without involving MS Excel application software. This is how the file looks like: 3. This directory, known as the python directory , is automatically added to the Python Search Path in order to allow the Python interpreter to locate all scripts installed at this location. Close the workbook. Your code would then be: def filter(txt, oldfile, newfile): '''\ Read a list of names from a file line by line into an output file. Tutorial 1: Create a simple XLSX file. It uses a text file for input. Data written using the tofile method can be read using this function. py file be opened, edited or printed? How can I convert. This closes the open direction file, whereupon the system performs the action of setting the direction to "out". This is then passed to the reader, which does the heavy lifting. BytesIO or tempfile. Using Python in ArcGIS Within ArcGIS, there are two options for working with and running python scripts: directly within ArcMap using the python window, or within an Integrated Development Environment (IDE) such as PythonWin. So the context is this; a zip file is uploaded into a web service and Python then needs extract that and analyze and deal with each file within. With Python there are several methods which can be used to check if a file exists, in a certain directory. You comma-separate them. Download the latest binary version of Python that runs on both Power PC and Intel systems and install it on your system. I would like create a python script that mounts a Windows smb share on a Mac then copies data to it. In this lecture we will discuss various options for reading files, and characterize them based on simplicity and efficiency (mostly with regards to efficiency in the use of space/memory, which is important when reading very large files). Python method open() opens the file file and set various flags according to flags and possibly its mode according to mode. The list sys. Python File Handling Python Read Files Python Write/Create Files Python Delete Files The open() function opens a file, and returns it as a file object. It will retain the same directory structures. Ivan Krstić is the director of security architecture at OLPC; pretend you opened this in a desktop text editor (nothing fancy like vi) and you saved it in UTF-8 format. This is a convenient way to create temporary HDF5 files, e. Build process. Step 1: Type file explorer options in Start menu or taskbar search box, and Press Enter to open File Explorer Options. IPython is open source (BSD license), and is used by a range of other projects; add your project to that list if it uses IPython as a library, and please don’t forget to cite the project. Other times, it means “to open the file in its default program”; and sometimes it means, “open the file in the program I specify”. I thought that it would be a tricky task until I stumbled up the filedialoge module and the askopenfilename function. The extensions are shown in the bottom of the form (Files of type). This closes the open direction file, whereupon the system performs the action of setting the direction to "out". I would like create a python script that mounts a Windows smb share on a Mac then copies data to it. Python open() The open() function opens the file (if possible) and returns a corresponding file object. It’s handy when you have two related operations which you’d like to execute as a pair, with a block of code in between. If you’re interested in creating and writing MS Word documents using python, check out the library python-docx. You will likely come into contact with file objects at some point while using Python, so knowing how to read and write. open() call (Python’s built-in open() does not support opening directories) and perform a os. Select and open the KML file. Python Consultant and Open Source Developer I've been using Wing Pro as my main development environment for 10 years now. If the script crashes, it may leave a copy of Excel running in the background. py ファイルは無いため、 No such file or directory (そんなファイル無いよ)というエラーになります。対処方法としては以下のいずれかがあります。. Although CSV files can be opened with many programs, like text editors, the data. Write code in your web browser, see it visualized step by step, and get live help from volunteers. Before we dive into processing tab-separated values, we will review how to read and write files with Python. OSCON – PORTLAND, OR – July 17, 2019 – Brandeis University’s Graduate Professional Studies division (GPS) will partner with The Open Source Initiative® (OSI) to provide new educational offerings for the open source community, the university announced at OSCON 2019. It will retain the same directory structures. IMPORTANT: To open your Python file again, locate the file in the folder, click once on the file name it to highlight it, then right-click on the mouse to see the options shown in the screen below, and select Edit with IDLE to open the editor window. •Why Python? •It is an integral part of Arcgis •Easy to read syntax •Large user community •Useful for scripts to control other programs. MicroPython is a full Python compiler and runtime that runs on the bare-metal. MIT OpenCourseWare is a free & open publication of material from thousands of MIT courses, covering the entire MIT curriculum. The SAS application is required to open and run SAS files, though you can view the files in a text editor, such as Notepad. I am quite new with Python, and I am having some problems trying to read data from a file. Python - NetCDF reading and writing example with plotting. The project is structured like a normal Python package with a standard setup. Luckily, Python provides a number of useful functions to working with files. What Is a CSV File? A CSV (comma separated values) file allows data to be saved in a tabular structure with a. As most other things in Python, the with statement is actually very simple, once you understand the problem it’s trying to solve. – krishnab May 9 '14 at 16:03. Python Books. Resources designed to fill key skills gaps as open source industry matures. With Python there are several methods which can be used to check if a file exists, in a certain directory. Ivan Krstić is the director of security architecture at OLPC; pretend you opened this in a desktop text editor (nothing fancy like vi) and you saved it in UTF-8 format. w+: Open a file for both writing and reading. The first argument to File may be a Python file-like object, such as an io. Save all of the above code to a file,. EXE instead of PYTHON. When checking if a file exists, often it is performed right before accessing (reading and/or writing) a file. Image processing in Python. This is a comprehensive Python Openpyxl Tutorial to read and write MS Excel files in Python. Used together, they. Read mode is the default mode for files you open in Python. Run open and read command on a file within python - not using a script. Your saved places will only appear on the device on which you saved them. Open Data Structures covers the implementation and analysis of data structures for sequences (lists), queues, priority queues, unordered dictionaries, ordered dictionaries, and graphs. Python 3 - Open File Dialog Window In Tkinter With filedialog I wanted to make a file loader for a chatbot program I am working on in Python 3 using Tkinter. This course will provide a gentle, yet intense, introduction to programming using Python for highly motivated students with little or no prior experience in programming. It also should instill a sense of danger in you because you can overwrite content and lose everything in just a moment. In the following example, we do just that and then print out the data we got:. All organizations big or small, trying to leverage the technology and invent some cool solutions. You comma-separate them. import xlrd workbook = xlrd. Clearing the screen ¶. The open() function takes two parameters; filename, and mode. We don't need to open the file and all we need is the filename. I would like create a python script that mounts a Windows smb share on a Mac then copies data to it. play() is only there to tell xbmc to play the file from that path, xbmc will then open that path using the virtual filesystem. Application always has a minimum number of running instances. csv extension. readlines() pattern suggested in another answer works quite well and is easier to work when you're developing the file processing that you have to do, but it does lead to the entire textual file content being allocated in main memory. Cocos2d Cocos2d is a family of open-source software frameworks for building cross-platform games&apps. CSV literally stands for comma separated variable, where the comma is what is known as a "delimiter. import modules. Another risk is that different Python implementations will do this clean-up at different times. One of the most common tasks computer programs perform is reading information from and writing information to files. Excel 2019 & 2016: Force “Open as Read Only” Prompt Posted on November 11, 2018 by Mitch Bartlett 6 Comments If you have a file that is sensitive to changes, you can force Microsoft Excel 2019, 2016, or 365 to prompt the user to open as Read Only whenever they attempt to open the file. MIT OpenCourseWare is a free & open publication of material from thousands of MIT courses, covering the entire MIT curriculum. Return to the Resources page. And this is the syntax for the open function. Writing Python Scripts in Unicode. File Handling File handling in Python requires no importing of modules. Meet Django. Loading a file into a list. Python read file line by line example Reading a text file line by line is pretty easy in python. lxml is a fast yet flexible library for XML processing in Python. Thousands of datasets can be stored in a single file, categorized and tagged however you want. Normally, the Python input. Python open Function. Question: I would like to understand the basics of how to write and execute a python program on Linux OS. Other times, it means “to open the file in its default program”; and sometimes it means, “open the file in the program I specify”. As the name suggest, the result will be read as a dictionary, using the header row as keys and other rows as a values. Source code for C executables, including the main function for the CPython interpreter (in versions prior to Python 3. py files to another format?. Does anyone know how to open edf files in python? I am looking for the way to manipulate SAXS detector's images as python-arrays. The cgi script runs fine but when I try to open this file, I get a permission error: Traceback (most recent call last): File "/asdf/pkgs/ Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. There’s plenty of Python modules for doing this on Pypi. com, you can find the many repositories that make up the Plone project, ranging from the core software itself to the documentation sources. py is a Python package that interfaces to gnuplot, the popular open-source plotting program. There may be hotfixes applicable to your version of Plone. Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. The open() syntax is like this:. Getting Started with Python Programming for Mac Users. If you don’t explicitly close a file, Python’s garbage collector will eventually destroy the object and close the open file for you, but the file may stay open for a while. 4 Distribution. The O’Reilly Open Source Awards recognize individual contributors who have demonstrated exceptional leadership, creativity, and collaboration in the development of open source software. Python method open() opens the file file and set various flags according to flags and possibly its mode according to mode. lxml is a fast yet flexible library for XML processing in Python. Python 101: How to Open a File or Program. Objectives Understand OpenStreetMap data structure How to parse it Get a feel of how basic GIS services work Andrii V. Python errors and exceptions Every programmer encounters errors, both those who are just beginning, and those who have been programming for years. Python open Function. addWidget (self. dll, File description: Python Core Errors related to python27. Following Python code can do the same thing (traditional method). argv contains the command-line arguments that a program was run with. py'), ('All files. Apart from that, I'll need to see the data file to understand what the code is supposed to do. The maximum size of files parsed by PyCharm is controlled by the idea. Download Download a free trial of PyXLL to start writing your Python Excel add-in. The path argument points to a pathname naming the file. This document outlines the interfaces to GIMP-Python, which is a set of Python modules that act as a wrapper to libgimp allowing the writing of plug-ins for GIMP. Ask Question Asked 6 years, 7 months ago. open("c:\autoexec. It uses a text file for input. The O’Reilly Open Source Awards recognize individual contributors who have demonstrated exceptional leadership, creativity, and collaboration in the development of open source software. This method involves invoking the subprocess of another program. Following is the syntax for open() method − os. Python Read JSON File Tutorial. A solution, represented by a. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform. BytesIO or tempfile. (So it's more useful to redirect the output to another file. The code below will simply show the dialog and return the filename. The O’Reilly Open Source Awards recognize individual contributors who have demonstrated exceptional leadership, creativity, and collaboration in the development of open source software. KDevelop showing the document switcher for easily switching between open documents (invoked via Ctrl+Tab) Screenshot. CSV literally stands for comma separated variable, where the comma is what is known as a "delimiter. close() , just as with other objects that hold resources (this is the dispose pattern ). Take a look at YourKit's leading softwa. FD_FILE_MUST_EXIST: For open dialog only: the user may only select files that actually exist. It will retain the same directory structures. Today I'm open sourcing "Grid studio", a web-based spreadsheet application with full integration of the Python programming language. We open the directory with the low-level os. Python Write to File. Now to re-open, or unpickle, your file. The cgi script runs fine but when I try to open this file, I get a permission error: Traceback (most recent call last): File "/asdf/pkgs/ Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Using Google Chrome on your computer, open Google Earth. One method also allowed us to check if a file exists and is accessible at the same time. ActiveState helps coders be more productive with open source languages and tools. Its a good way to explore possibilities, which can then be pasted into larger scripts. Python Read File, Write File, Open File, Delete File, Copy File Pankaj Leave a Comment In this tutorial we are going to learn about Python File Operations such as python read file, python write file, open file, delete file and copy file. Python open() 函数. also, when you do object. Following Python code can do the same thing (traditional method). In test_notebookc. We need to be very careful while writing data into the file as it overwrites the content present inside the file that you are writing, and all the previous data will be erased. to use this, we would use pickle. The input ("") function only accepts integers and floating point numbers. I suggest using with instead of try: finally: to close a file that was written to. 5) to wrap our code for opening a file object, the internals of Python will do something similar to the following code to ensure that no matter what the file object is closed after use. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: