How do I check what version of Python is running my script?
如何检查Python解释器的哪个版本正在解释我的脚本？
This information is available in the sys.version string in the sys module:
>>> import sys
Human readable:
>>> 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:
>>> sys.version_info
(2, 5, 2, 'final', 0)
# or
>>> 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 >= (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 "duck" 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.
From the command line (note the capital 'V'):
python -V
This is documented in 'man python'.
I like sys.hexversion for stuff like this.
http://docs.python.org/library/sys.html#sys.hexversion
>>> import sys
>>> sys.hexversion
33883376
>>> '%x' % sys.hexversion
'20504f0'
>>> sys.hexversion < 0x02060000
True
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