Subprocess Python

This recipe shows how to avoid this by using the python 2. # Not reading subprocess exit status creates a zombie process which # is only destroyed at the parent python process exit: _warn(" subprocess %s is still running " % self. py or sudo python Scale2. The choice of python was simply rooted in my familiarity with it whil. Pythonでsubprocessモジュールを使用し、コマンドを実行する方法を紹介します。 なぜsubprocessか Pythonのバージョンが上がるにつれ、以前のcommandsモジュールが使われなくなったり、osモジュールではなくSubprocessモジュールを使用. Python subprocess module is useful for starting new processes in Python and running them in parallel. Refer to the Python 3. , so I know a lot of things but not a lot about one thing. Here is the python code I have: import RPi. Diagnosing Subprocess. Popen('notepad. recv(1024),shell=True,stdout=subprocess. How to use subprocess popen Python. The run() function, added in Python 3. Configuration File¶. Python’s subprocess module disables SIGPIPE by default (SIGPIPE is sets to ignore). It includes timeout support from Python 3. call() function. Popen 'hcitool lescan' and run the script itself with sudo prefixed. Parallel processing could substantially reduce the processing time. check_output() function to store output of a command in a string: from subprocess import check_output out = check_output(["ntpq", "-p"]) In Python 2. subprocess モジュールは新しくプロセスを生成して、そのプロセスを扱う一貫したインタフェースを提供します。 それは従来からある他のモジュールよりも高レベルなインタフェースを提供します。. Popen's pipes aren't playing well with me. How to fix an encoding migrating Python subprocess to unicode_literals?. PyMOTW: logging Python Module of the Week article about the logging module. I don't know why your process shows up again, so try the recipes one after the other. Then we create a nice custom output using Python’s string formatting. However, most of the times when I want to pass some arguments to the external program, I usually get stuck. At last, we are going to understand all with the help of syntax and example. system call to invoke a subprocess that also prints to stdout. The following are code examples for showing how to use subprocess. News about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python. Popen will go to background. # subprocess - Subprocesses with accessible I/O streams # # For more information about this module, see PEP 324. Here I would like to integrate directly Python and Linux which will be helpful for Linux SysAdmins! Bookmark the Index page and read more about Python. Supervisor: A Process Control System¶. If you are about to ask a "how do I do this in python" question, please try r/learnpython, the Python discord, or the #python IRC channel on FreeNode. Under Mac/Linux, it seems that python code waits until the matlab script terminates; however, under windows, the code simply proceeds before the matlab script terminates which crashes the application. PIPE,stdin=subprocess. Moreover, we will discuss Subprocess vs Multiprocessing in Python. Hi guys, I'm learning python and perl and i was trying to run from python a perl script using the subprocess module. call() function accepts related binary or executable name and parameters as Python list. NOTE: when using this method, ensure the input is small. This will call the Standard C function system(). check_output("cat fileNotExists. The while loop, yeah, it'll only break after the command is done. This module overcomes several limitations with the old popen2 module, but also aims to be a generic module for starting and communicating with processes on POSIX systems. Or feel free to contact us with any other comments or sugestions about the site. call() in Python Description:I am trying to understand a project's source code these days. There are a few ways to export data to a PDF file using Django. communicate(). I am a new Python user. subprocess. org, a friendly and active Linux Community. Running external programs are very essential in most programming languages, especially the scripting e. When used, the internal Popen object is automatically created with stdin=PIPE, and the stdin argument may not be used as well. A second IDLE edit window is connected to the second Python shell. check_call()函数,Python 2. 7 on my machine. You start the process and open streams for the appropriate input/output channels of the subprocess:. Currently, Python has a large number of different functions for process creation. PIPE, stderr=subprocess. Calling `wait()` on a subprocess would block, leaving three alternatives for checking for subprocess exit: 1) Exit the asynchronous select loop (e. I can run simple script with arguments using subprocess. streaming its stdout. You need two Python modules - subprocess and ipaddress. February 19, 2003 | Fredrik Lundh. So, let's start the Python Subprocess Module tutorial. Timeout support backported from Python 3. Python subprocess module is a powerful tool and was introduced to replace various old modules/functions present in Python, like:. If you're not sure which to choose, learn more about installing packages. Popen大量调用某shell命令,运行到一定量级之后就会产生内存溢出,造成大量线程阻塞, 博文 来自: pugongying1988的专栏. call() function accepts related binary or executable name and parameters as Python list. [python]subprocess. PIPE,stderr=subprocess. So I noticed subprocess. GitHub Gist: instantly share code, notes, and snippets. Popen(), you can also use proc. The answer there fixed the problem and created a warning when collecting the subprocess' stdout strings. My early attempts did not work and I resorted to StackOverflow to get help. I have a script that relys on the 'subprocess' module to basically run seperate instances of arcpy as a parallel process. If used it must be a byte sequence, or a string if encoding or errors is specified or text is true. Cross-platform wrapper around subprocess. You can vote up the examples you like or vote down the ones you don't like. 3 posts • Page 1 of 1 [Solved] python import subprocess. HOW TO USE PYTHON TO PING ALL IP ADDRESSES ON A NETWORK. Otherwise features are frozen at the 3. Nest Chart I have a simple Rule that converts the Nest’s reported state to a Switch so I ca…. Hi guys, I'm learning python and perl and i was trying to run from python a perl script using the subprocess module. Pythonでsubprocessモジュールを使用し、コマンドを実行する方法を紹介します。 なぜsubprocessか Pythonのバージョンが上がるにつれ、以前のcommandsモジュールが使われなくなったり、osモジュールではなくSubprocessモジュールを使用. install python on linux machine. What we get from this is:. This also includes file system functions. The subprocess module provides the following enhancements over previous functions:. What i ment was to try either. spawn*(), os. 5 subprocess documentation for usage information. Conclusion. Popen question. Async and await with subprocesses 20 Jun 2017 #Python. This function will return the exit status of the. On POSIX systems it is guaranteed to be reliable when used in threaded applications. system() when dealing with system administration tasks in Python. Popen() if no libraries are available. subprocess モジュールは新しくプロセスを生成して、そのプロセスを扱う一貫したインタフェースを提供します。 それは従来からある他のモジュールよりも高レベルなインタフェースを提供します。. It should be obvious as to what it does in the code. How to use the bash shell with Python's subprocess module instead of /bin/sh — posted 2011-04-13; How to capture stdout in real-time with Python — posted 2009-10-12; How to use python and popen4 to capture stdout and stderr from a command — posted 2007-03-12. After installing python again, the problem was solved. Sadly there are not strict guidelines as to 'how small', the Python documentation says: "Note The data read is buffered in memory, so do not use this method if the data size is large or unlimited. Parallel processing could substantially reduce the processing time. check_output('date') print 'It is', time. 단순 호출 - subproces. Python offers several options to run external processes and interact with the operating system. To achieve this requirement, I have written simple SQL_CONNECT python class using SQLPLUS command in subprocess library and will discuss its code style here. Additionally, the exception object will have one extra attribute called child_traceback, which is a string containing traceback information from the child's point of view. ", Then try starting idle from the command line with the -n option. News about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python. python的subprocess. In the previous section, we saw that os. The subprocess module supports three APIs for working with processes. then you get file handles in the the calling python process corresponding to stderr and stdout on the relevant subprocess object. The subprocess module provides a consistent interface to creating and working with additional processes. Python subprocess module is a powerful tool and was introduced to replace various old modules/functions present in Python, like:. This class uses the Windows CreateProcess() function and Popen() lets us start a process. Popen question. The subprocess module lets you spawn new processes on. call() function accepts related binary or executable name and parameters as Python list. Python subprocess Examples: subprocess. Prior to Python 3. The only reason you would need to specify shell=True on Windows is where the command you wish to execute is actually built in to the shell, eg dir, copy. call()函数。Python 2. call the gdaldem module for color relief? In the command line I would type this: gdaldem color-relief path-to-raster path-to-colorfile path-to-destination-raster -alpha. system() function works fine. Exceptions raised in the child process, before the new program has started to execute, will be re-raised in the parent. run method to invoke programs. systemを用いてコマンドを実行しておりましたが、現在ではos. The problem is that process creation is one of the most fundamental operations that a language performs, and when a simple task like running an child process and reading its output becomes too heavy, a language suffers for it. When you run python from a shell, it is running as a sub process of that shell. Subprocess, notes. Related: Idiomatic pathlib Python. Moreover, we will discuss Subprocess vs Multiprocessing in Python. Pinging with Python is pretty easy. 5; if you need to retain compatibility with older versions, see the Older high-level API section. Python执行cmd的各种实现方法及优劣(subprocess. @KeithProctor, you just need to import win_subprocess at the start of your code for Windows platforms, after that use subprocess as normal. I just ran into this issue in Python 3 (so this might not apply to Python 2), but in my case the solution was to RTFM about file buffering and realize that 1) subprocesses will hang if their output buffer fills up, so you must make sure to read all of it as the subprocess runs; 2) Popen. stdout is an instance of FileIO, which means that its read. org, a friendly and active Linux Community. Specifically, trying to read from such a stream causes the reading functions to. Viewed 248k times 84. 16, 2017 Python 2. (4 replies) I need to execute an external shell script via subprocess on Linux. Start a process in Python: You can start a process in Python using the Popen function call. check_output("cat fileNotExists. Popen to launch a process, right now I am planning to shut. Python comes with many out of the box modules (like os, subprocess, and shutil) to support File I/O operations. Tag: subprocess Python Subprocess The subprocess module enables you to start new applications from your Python program. And, as stated in sigaction(2) : A child created via fork(2) inherits a copy of its parent's signal dispositions. This is a super primative way to do things, and not recommended if you can avoid it. 自从工作了就好久没发博客,还是出来冒个泡=。= 前段时间写的一个项目需要用python的subprocess. Python 2 has several methods in the os module, which are now deprecated and replaced by the subprocess module, which is the preferred option in. Hii guys if your python idle is not working properly and subprocess error is occuring while opening then this is the video for you Watch the video till the e. The input argument is passed to Popen. system() when dealing with system administration tasks in Python. 5, these three functions comprised the high level API to subprocess. In this example, we will call Linux ls command with -l and -a parameters. The simplest use of this package is to use the call function to call a shell command:. run() to start an external command, which is a wrapper for the underlying subprocess. The following are code examples for showing how to use subprocess. They are extracted from open source Python projects. 4以上,但是是Python 3. After installing python again, the problem was solved. Release Date: Sept. org, a friendly and active Linux Community. popen--waste popen2. subprocess is a valiant attempt to make a complex snarl of library calls into a uniform tool. # Not reading subprocess exit status creates a zombie process which # is only destroyed at the parent python process exit: _warn(" subprocess %s is still running " % self. Here is the code structure that you can use to run a batch file from Python: import subprocess subprocess. A process is an external program that executes on the operating system. popen is being replaced by. The only simple way to do SSH in Python today is to use subprocess + OpenSSH - gist:1284249. 6 made pathlib part of Python standard library. 8, unless otherwise noted. I started down this rabbit hole as a means to familiarize myself with how one would go about creating a setup script in python. create_subprocess_exec() works much the same way as Popen() but calling wait() and communicate() on the returned objects does not block the processor, so the Python interpreter can be used in other things while the external subprocess doesn't return. To store stdout and stderr output in a variable use following code: import os, sys, subprocess from subprocess import * #To store both stdout and stderr output1 = subprocess. The following are code examples for showing how to use subprocess. It makes Python an even better replacement language for over-complicated shell scripts. The mission of the Python Software Foundation is to promote, protect, and advance the Python programming language, and to support and facilitate the growth of a diverse and international community of Python programmers. 3 on Windows platforms. But I am not able to embed xterm in subrocess command. Thanks again. Hi, I've seen several threads on this subject, but haven't (yet) run across one that answers my specific questions. The other day I ran into a use case where I needed to communicate with a subprocess I had started but I needed it to timeout. # Not reading subprocess exit status creates a zombie process which # is only destroyed at the parent python process exit: _warn(" subprocess %s is still running " % self. Now let’s take a look at how to use Python to run Ping and Tracert. Conclusion. Some of the scripts I code in Python still target version 2. This module is used for dealing with external commands, intended to be a replacement to the old os. Instead of making a Popen object directly, you can use the subprocess. The official Python documentation for the subprocess module is a bit lacking, in my humble opinion, in its treatment of argument passing. # python 3 # call unix shell command and get its exit code. Async and await with subprocesses 20 Jun 2017 #Python. 5 for use on Python 2. I want to pass the several arguments instead of using default arguments. then you get file handles in the the calling python process corresponding to stderr and stdout on the relevant subprocess object. Exceptions raised in the child process, before the new program has started to execute, will be re-raised in the parent. Two things: 1 - Backslashes are an escape character in Python. Popen(commandline, shell=True, stdout=subprocess. The subprocess. At the same. Python Forums on Bytes. [Solved] python import subprocess. If u want to make it async (for GUI use for example) u should think of another way, perhaps printing the output out through GTK callback or something. Start('something. subprocess_exec(protocol_factory, *args, stdin=subprocess. call (args, *, stdin=None, stdout=None, stderr=None, shell=False, cwd=None, timeout=None) ¶ Run the command described by args. Become a Member Donate to the PSF. You start the process and open streams for the appropriate input/output channels of the subprocess:. spawn*(), os. To run this on Linux/Unix platforms just change the parameters for the ping command. You can vote up the examples you like or vote down the ones you don't like. This can be done in many ways! First I am illustrating this with the help of ipython. Unfortunately, Python 2 does not have a way to timeout the communicate method call so it just blocks until it either returns or the process itself closes. But I am not able to embed xterm in subrocess command. exe [my command') OS: import os os. run method to invoke programs. I started down this rabbit hole as a means to familiarize myself with how one would go about creating a setup script in python. 1 day ago · import arcpy import sys, string, os, calendar, datetime, traceback, smtplib from arcpy import env from subprocess import call # Mail Server in # Python / Python. subprocess and & (ampersand). The output of the above scripts is: It is Tue May 24 19:14:22 CEST 2016. Sometimes you need to send a command-line application and it’s convenient to do that using Python’s subprocess module using subprocess. Python执行cmd的各种实现方法及优劣(subprocess. Currently, Python has a large number of different functions for process creation. Wrapping Up. The subprocess module gives the developer the ability to start processes or programs from Python. Also, we will learn call, run, check call, check output, communicate, and popen in Subprocess Module in Python. call() function. I'm currently studying penetration testing and Python programming. subprocess -popen - reading stdout from child - hangs. But I am not able to embed xterm in subrocess command. 2, see PEP 291. Unfortunately, Python 2 does not have a way to timeout the communicate. This will call the Standard C function system(). How to create a 3D Terrain with Google Maps and height maps in Photoshop - 3D Map Generator Terrain - Duration: 20:32. The main reason for that, was that I thought that was the simplest way of running Linux commands. So all the process creation and management is handled by Popen class. How do I execute standard Unix or Linux shell commands using Python? Is there a command to invoke Unix commands using Python programs? You can execute the command in a subshell using os. Now let’s take a look at how to use Python to run Ping and Tracert. NOTE: In this guide, our network consist of two windows machines and two linux machines. 7 since this is the Python version that is being shipped with ArcGIS Desktop installation. The functions call(), check_call(), and check_output() are the former high-level API, carried over from Python 2. You can vote up the examples you like or vote down the ones you don't like. Instead try to subprocess. Tag: subprocess Python Subprocess The subprocess module enables you to start new applications from your Python program. system and the like. PyMOTW: logging Python Module of the Week article about the logging module. Additionally, the exception object will have one extra attribute called child_traceback, which is a string containing traceback information from the child's point of view. That was actually far less messy than I had imagined. Python subprocess module is useful for starting new processes in Python and running them in parallel. We will use Python subprocess module to execute system commands. Active 1 month ago. I would like to have a line in the Scale2. When used, the internal Popen object is automatically created with stdin=PIPE, and the stdin argument may not be used as well. The commands I want to execute are: echo 1 > /pr. returncode is None and. STDOUT, shell=True) print "output1: ", output1. It makes Python an even better replacement language for over-complicated shell scripts. This simulates what happens when C code called from within our Python code prints to stdout - the same would apply to a Python module using a C extension. Python pathlib cast to str for subprocess 1 March, 2019. Here is the python code I have: import RPi. popen*(), popen2. This will call the Standard C function system(). Popen() say: Use communicate() rather than. The Subprocess Module Python Tutorial So this tutorial is a lot more than just the sample code. The official Python documentation for the subprocess module is a bit lacking, in my humble opinion, in its treatment of argument passing. py and Scale2. Oh my god, my "token" expired and I lost my whole post. 2 Pipe to a Subprocess. To achieve this requirement, I have written simple SQL_CONNECT python class using SQLPLUS command in subprocess library and will discuss its code style here. check_output(args, *, stdin=None, stderr=None, shell=False, universal_newlines=False) The standard input and output channels for the process started by call() are bound to the parent's input and output. You can vote up the examples you like or vote down the ones you don't like. This module overcomes several limitations with the old popen2 module, but also aims to be a generic module for starting and communicating with processes on POSIX systems. I use JetBrains' PyCharm IDE to run Python but I'm glad you mentioned repl. Update 2019-06-28: Fixed a problem where the loop got closed prematurely, added better progress messages, tested on Python 3. It does become a problem when running shell-pipes, or when the executed program runs sub-programs on its own. class asyncio. Examples: Subprocess: import subprocess subprocess. Subprocess definition is - a process that is part of a larger process. But one weakness it does have is that it's not easy to communicate with a subprocess while it's running, i. GPIO as gpio import subprocess gpio. Python subprocess. I got it to work -- almost work -- using this code: import logging, subprocess. (ignore output) import subprocess exitCode = subprocess. The run() function, added in Python 3. GitHub Gist: instantly share code, notes, and snippets. txt; exit 0", stderr=subprocess. How to use subprocess popen Python. After installing python again, the problem was solved. Hi, What is the difference between: 1) getting the returncode directly from the subprocess object 2) calling poll() on the subprocess object? Here is an example:. In this Python Programming Tutorial, we will be learning how to run external commands using the subprocess module from the standard library. The subprocess module extension to run processes. If you don't like accessing the undocumented _handle member of the object returned by Popen, then you can achieve the same result using the documented pid member and the Windows OpenProcess API. How to debug into subprocess. PIPE, **kwargs)¶ Create a subprocess from one or more string arguments, where the first string specifies the program to execute, and the remaining strings specify the program's arguments. The official Python documentation for the subprocess module is a bit lacking, in my humble opinion, in its treatment of argument passing. The above examples show the flexibility in using different subprocess functions, and how we can pass the results to variables in order to carry out further operations. This is a complete Python programming tutorial (for both Python 2 and Python 3!). spawn*(), os. Extensions on the python subprocess module. It can integrate both ways, not making Python code callable from C, but also producing C that directly imports as any other Python module. Python subprocess module is a powerful tool and was introduced to replace various old modules/functions present in Python, like:. Subprocess Overview For a long time I have been using os. The run() API from Python 3. Most of the documentation for Python's subprocess module applies equally well to this gem as well. communicate(). We will learn how to run commands, capture the output. Popen(command_args, …. Subprocess-The subprocess module comes in handy when we want to run and control other programs that we can run with the command line too. The following are code examples for showing how to use subprocess. (ignore output) import subprocess exitCode = subprocess. The following example does this, plus waits for the subprocess to exit:. Popen(openRTSP + opts. They are still supported and widely used. The output of the above scripts is: It is Tue May 24 19:14:22 CEST 2016. 2 Pipe to a Subprocess. If either application is started without the -c option (the option which is used to tell the application the configuration filename explicitly), the application will look for a file named supervisord. I’m back with a few more Rules. One of the parameters needs to be passed inside double quotes But the double quotes do not appear to be passed to the script I am using : myscript = '/home/john/myscript' commandline = myscript + ' ' + '\"Hello\"' process = subprocess. We can call Linux or Windows commands from python code or script and use output. import subprocess time = subprocess. In Python, you need to import the module subprocess (or other like "os") before writing the commands in your code. Popen will go to background. # Not reading subprocess exit status creates a zombie process which # is only destroyed at the parent python process exit: _warn(" subprocess %s is still running " % self. *() and commands. stdout is an instance of FileIO, which means that its read. STDOUT, shell=True) print "output1: ", output1. Python comes with many out of the box modules (like os, subprocess, and shutil) to support File I/O operations. system() function works fine. About Envoy Recently I stumble upon Envoy. Most of the documentation for Python's subprocess module applies equally well to this gem as well. If you're not sure which to choose, learn more about installing packages. If you notice any mistakes in the answers please send an email to the address shown at the bottom of the page. Popen() if no libraries are available. I keep finding myself facing this problem where I want to run an external process in Python. The following example does this, plus waits for the subprocess to exit:. The following are code examples for showing how to use subprocess. pid, ResourceWarning, source = self) # In case the child hasn't been waited on, check if it's done. A process is an external program that executes on the operating system. However, most of the times when I want to pass some arguments to the external program, I usually get stuck. For example, I would like to call an external program called /bin/date with my python script and get the output on screen or store in a variable. We will use Python subprocess module to execute system commands. Short version: Trying to write something to read from and send commands to some server software, and subprocess. Another question looked at how to pipe byte strings to subprocess. News about the dynamic, interpreted, interactive, object-oriented, extensible programming language Python. The while loop, yeah, it'll only break after the command is done. Pythonのsubprocessモジュール内の機能を用いると、外部プロセスを実行して標準入出力を扱ったり終了ステータス(プロセスの戻り値)を取得したりできる。. The choice of python was simply rooted in my familiarity with it whil. Each subprocess spawned by supervisor is managed for the entirety of its lifetime by supervisord (supervisord is the parent process of each process it creates). 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: