How do I check what version of Python is running my script

Question

How can I check what version of the Python Interpreter is interpreting my script

User · Answer

Put something like      usr bin env python import sys if sys version info lt  2 6 0     sys stderr write  You need python 2 6 or later to run this script n     exit 1    at the top of your script   Note that depending on what else is in your script  older versions of python than the target may not be able to even load the script  so won t get far enough to report this error  As a workaround  you can run the above in a script that imports the script with the more modern code

User · Answer

Check Python version  python -V or python --version or apt-cache policy python  you can also run whereis python to see how many versions are installed

User · Answer

Like Seth said  the main script could check sys version info  but note that that didn t appear until 2 0  so if you want to support older versions you would need to check another version property of the sys module    But you still need to take care of not using any Python language features in the file that are not available in older Python versions  For example  this is allowed in Python 2 5 and later   try      pass except      pass finally      pass   but won t work in older Python versions  because you could only have except OR finally match the try  So for compatibility with older Python versions you need to write   try      try          pass     except          pass finally      pass

User · Answer

Just for fun  the following is a way of doing it on CPython 1 0-3 7b2  Pypy  Jython and Micropython   This is more of a curiosity than a way of doing it in modern code   I wrote it as part of http   stromberg dnsalias org  strombrg pythons    which is a script for testing a snippet of code on many versions of python at once  so you can easily get a feel for what python features are compatible with what versions of python   via platform   0 check sys   0 via sys version info   0 via sys version   0 test sys   0 try      import platform except  ImportError  NameError         We have no platform module - try to get the info via the sys module     check sys   1  if not check sys      if hasattr platform   python version            via platform   1     else          check sys   1  if check sys      try          import sys         test sys   1     except  ImportError  NameError             just let via sys version info and via sys version remain False - we have no sys module         pass  if test sys      if hasattr sys   version info            via sys version info   1     elif hasattr sys   version            via sys version   1     else            just let via sys remain False         pass  if via platform        This gives pretty good info  but is not available in older interpreters   Also  micropython has a       platform module that does not really contain anything      print platform python version    elif via sys version info        This is compatible with some older interpreters  but does not give quite as much info      print   s  s  s    sys version info  3   elif via sys version      import string       This is compatible with some older interpreters  but does not give quite as much info      verbose version   sys version     version list   string split verbose version      print version list 0   else      print  unknown

User · Answer

sys version info doesn t seem to return a tuple as of 3 7  Rather  it returns a special class  so all of the examples using tuples don t work  for me at least  Here s the output from a python console    gt  gt  gt  import sys  gt  gt  gt  type sys version info   lt class  sys version info  gt    I ve found that using a combination of sys version info major and sys version info minor seems to suffice  For example      import sys if sys version info major  gt  3      print  Upgrade to Python 3       exit 1    checks if you re running Python 3   You can even check for more specific versions with      import sys ver   sys version info if ver major  gt  2      if ver major    3 and ver minor  lt   4          print  Upgrade to Python 3 5           exit 1    can check to see if you re running at least Python 3 5

User · Answer

A attempt using os popen to read it in a variable  import os ver   os popen  python -V   read   strip   print ver

User · Answer

With six module  you can do it by   import six  if six PY2      this is python2 x else      six PY3     this is python3 x

User · Answer

The even simpler simplest way   In Spyder  start a new  IPython Console   then run any of your existing scripts   Now the version can be seen in the first output printed in the console window    Python 3 7 3  default  Apr 24 2019  15 29 51

User · Answer

From the command line  note the capital  V    python -V  This is documented in  man python   From IPython console  python -V

User · Answer

This information is available in the sys version string in the sys module   gt  gt  gt  import sys  Human readable   gt  gt  gt  print sys version     parentheses necessary in python 3         2 5 2  r252 60911  Jul 31 2008  17 28 52    GCC 4 2 3  Ubuntu 4 2 3-2ubuntu7    For further processing  use sys version info or sys hexversion   gt  gt  gt  sys version info  2  5  2   final   0    or  gt  gt  gt  sys hexversion 34014192  To ensure a script runs with a minimal version requirement of the Python interpreter add this to your code  assert sys version info  gt    2  5   This compares major and minor version information  Add micro   0  1  etc  and even releaselevel    alpha   final   etc  to the tuple as you like  Note however  that it is almost always better to  quot duck quot  check if a certain feature is there  and if not  workaround  or bail out   Sometimes features go away in newer releases  being replaced by others

User · Answer

To check from the command-line  in one single command  but include major  minor  micro version  releaselevel and serial  then invoke the same Python interpreter  i e  same path  as you re using for your script    gt  path to your python -c  import sys  print          -  -    format  sys version info     3 7 6-final-0   Note   format   instead of f-strings or     join   allows you to use arbitrary formatting and separator chars  e g  to make this a greppable one-word string  I put this inside a bash utility script that reports all important versions  python  numpy  pandas  sklearn  MacOS  xcode  clang  brew  conda  anaconda  gcc g   etc  Useful for logging  replicability  troubleshootingm bug-reporting etc

User · Answer

Your best bet is probably something like so     gt  gt  gt  import sys  gt  gt  gt  sys version info  2  6  4   final   0   gt  gt  gt  if not sys version info  2      2  6          print  Error  I need python 2 6      else         from my module import twoPointSixCode  gt  gt  gt     Additionally  you can always wrap your imports in a simple try  which should catch syntax errors  And  to  Heikki s point  this code will be compatible with much older versions of python     gt  gt  gt  try          from my module import twoPointSixCode     except Exception           print  can t import  probably because your python is too old    gt  gt  gt

User · Answer

from sys import version info  api version  version  hexversion  print f sys version   version    print f sys api version   api version    print f sys version info   version info    print f sys hexversion   hexversion      output   sys version  3 6 5  v3 6 5 f59c0932b4  Mar 28 2018  17 00 18   MSC v 1900 64 bit  AMD64   sys api version  1013 sys version info  sys version info major 3  minor 6  micro 5  releaselevel  final   serial 0  sys hexversion  50726384

User · Answer

To verify the Python version for commands on Windows  run the following commands in a command prompt and verify the output   c   gt python -V Python 2 7 16  c   gt py -2 -V Python 2 7 16  c   gt py -3 -V Python 3 7 3   Also  To see the folder configuration for each Python version  run the following commands   For Python 2  py -2 -m site  For Python 3  py -3 -m site

User · Answer

import sys sys version split      0    sys version gives you what you want  just pick the first number

User · Answer

Several answers already suggest how to query the current python version  To check programmatically the version requirements  I d make use of one of the following two methods     Method 1   see krawyoti s answer  import sys assert sys version info  gt    2 6      Method 2   import platform from distutils version import StrictVersion  assert StrictVersion platform python version     gt    2 6

User · Answer

Here s a short commandline version which exits straight away  handy for scripts and automated execution    python -c  print   import    sys   version     Or just the major  minor and micro   python -c  print   import    sys   version info  1       2   python -c  print   import    sys   version info  2       2  7  python -c  print   import    sys   version info  3       2  7  6

User · Answer

If you are working on linux just give command python  output will be like this     Python 2 4 3   1  Jun 11 2009  14 09 37        GCC 4 1 2 20080704  Red Hat 4 1 2-44   on linux2      Type  help    copyright    credits  or  license  for more   information

User · Answer

Use platform s python version from the stdlib    gt  gt  gt  from platform import python version  gt  gt  gt  print python version    2 7 8

User · Answer

I like sys hexversion for stuff like this   gt  gt  gt  import sys  gt  gt  gt  sys hexversion 33883376  gt  gt  gt    x    sys hexversion  20504f0   gt  gt  gt  sys hexversion  lt  0x02060000 True

User · Answer

If you want to detect pre-Python 3 and don t want to import anything       you can  ab use list comprehension scoping changes and do it in a single expression  is python 3 or above    lambda x   x for x in  False   and None or x  True

User · Answer

The simplest way  Just type python in your terminal and you can see the version   as like following   desktop    python Python 2 7 6  default  Jun 22 2015  18 00 18    GCC 4 8 2  on linux2 Type  help    copyright    credits  or  license  for more information   gt  gt  gt

[python] How do I check what version of Python is running my script?

Examples related to python

Examples related to version