问题
I have to run a Python script on a Windows server. How can I know which version of Python I have, and does it even really matter?
I was thinking of updating to the latest version of Python.
回答1:
python -V
http://docs.python.org/using/cmdline.html#generic-options
--version may also work (introduced in version 2.5)
回答2:
Python 2.5+:
python --version
Python 2.4-:
python -c 'import sys; print(sys.version)'
回答3:
In a Python IDE, just copy and paste in the following code and run it (the version will come up in the output area):
import sys
print(sys.version)
回答4:
At a command prompt type:
python -V
Or if you have pyenv:
pyenv versions
回答5:
When I open Python (command line) the first thing it tells me is the version.
回答6:
Although the question is "which version am I using?", this may not actually be everything you need to know. You may have other versions installed and this can cause problems, particularly when installing additional modules. This is my rough-and-ready approach to finding out what versions are installed:
updatedb # Be in root for this
locate site.py # All installations I've ever seen have this
The output for a single Python installation should look something like this:
/usr/lib64/python2.7/site.py
/usr/lib64/python2.7/site.pyc
/usr/lib64/python2.7/site.pyo
Multiple installations will have output something like this:
/root/Python-2.7.6/Lib/site.py
/root/Python-2.7.6/Lib/site.pyc
/root/Python-2.7.6/Lib/site.pyo
/root/Python-2.7.6/Lib/test/test_site.py
/usr/lib/python2.6/site-packages/site.py
/usr/lib/python2.6/site-packages/site.pyc
/usr/lib/python2.6/site-packages/site.pyo
/usr/lib64/python2.6/site.py
/usr/lib64/python2.6/site.pyc
/usr/lib64/python2.6/site.pyo
/usr/local/lib/python2.7/site.py
/usr/local/lib/python2.7/site.pyc
/usr/local/lib/python2.7/site.pyo
/usr/local/lib/python2.7/test/test_site.py
/usr/local/lib/python2.7/test/test_site.pyc
/usr/local/lib/python2.7/test/test_site.pyo
回答7:
In [1]: import sys
In [2]: sys.version
2.7.11 |Anaconda 2.5.0 (64-bit)| (default, Dec 6 2015, 18:08:32)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]
In [3]: sys.version_info
sys.version_info(major=2, minor=7, micro=11, releaselevel='final', serial=0)
In [4]: sys.version_info >= (2,7)
Out[4]: True
In [5]: sys.version_info >= (3,)
Out[5]: False
回答8:
In short:
Type
pythonin a command prompt
Simply open the command prompt (<kbd>Win</kbd> + <kbd>R</kbd>) and type cmd and in the command prompt then typing python will give you all necessary information regarding versions:
回答9:
>>> import sys; print('{0[0]}.{0[1]}'.format(sys.version_info))
3.5
so from the command line:
python -c "import sys; print('{0[0]}.{0[1]}'.format(sys.version_info))"
回答10:
Use
python -V
or
python --version
NOTE: Please note that the "V" in the python -V command is capital V. python -v (small "v") will launch Python in verbose mode.
回答11:
You can get the version of Python by using the following command
python --version
You can even get the version of any package installed in venv using pip freeze as:
pip freeze | grep "package name"
Or using the Python interpreter as:
In [1]: import django
In [2]: django.VERSION
Out[2]: (1, 6, 1, 'final', 0)
回答12:
If you are already in a REPL window and don't see the welcome message with the version number, you can use help() to see the major and minor version:
>>>help()
Welcome to Python 3.6's help utility!
...
回答13:
Just create a file ending with .py and paste the code below into and run it.
#!/usr/bin/python3.6
import platform
import sys
def linux_dist():
try:
return platform.linux_distribution()
except:
return "N/A"
print("""Python version: %s
dist: %s
linux_distribution: %s
system: %s
machine: %s
platform: %s
uname: %s
version: %s
""" % (
sys.version.split('\n'),
str(platform.dist()),
linux_dist(),
platform.system(),
platform.machine(),
platform.platform(),
platform.uname(),
platform.version(),
))
If several Python interpreter versions are installed on a system, run the following commands.
On Linux, run in a terminal:
ll /usr/bin/python*
On Windows, run in a command prompt:
dir %LOCALAPPDATA%\Programs\Python
回答14:
I have Python 3.7.0 on Windows 10.
This is what worked for me in the command prompt and Git Bash:
To run Python and check the version:
py
To only check which version you have:
py --version
or
py -V # Make sure it is a capital V
Note: python, python --version, python -V,Python, Python --version, Python -V did not work for me.
回答15:
On Windows 10 with Python 3.6
python
Python 3.6.0a4 (v3.6.0a4:017cf260936b, Aug 16 2016, 00:59:16) [MSC v.1900 64 bit (AMD64)] on win32
python -V
Python 3.6.0a4
python --version
Python 3.6.0a4
回答16:
If you have Python installed then the easiest way you can check the version number is by typing "python" in your command prompt. It will show you the version number and if it is running on 32 bit or 64 bit and some other information. For some applications you would want to have a latest version and sometimes not. It depends on what packages you want to install or use.
回答17:
For me, opening CMD and running
py
will show something like
Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
回答18:
To verify the Python version for commands on Windows, run the following commands in a command prompt and verify the output:
c:\> python -V
Python 2.7.16
c:\> py -2 -V
Python 2.7.16
c:\> 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'
回答19:
Open a command prompt window (press Windows + R, type in cmd, and hit Enter).
Type python.exe
来源：https://stackoverflow.com/questions/8917885/which-version-of-python-do-i-have-installed