已经有几个答案建议如何查询当前的python版本。为了以编程方式检查版本需求，我将使用以下两种方法之一:

# Method 1: (see krawyoti's answer)
import sys
assert(sys.version_info >= (2,6))

# Method 2: 
import platform
from distutils.version import StrictVersion 
assert(StrictVersion(platform.python_version()) >= "2.6")

检查Python版本:Python -V或Python——version或apt-cache policy Python

你也可以运行whereis python查看安装了多少个版本。

要从命令行检查，在一个命令中，但包括major, minor, micro version, releaslevel和serial，然后调用与你的脚本使用的相同的Python解释器(即相同的路径):

> path/to/your/python -c "import sys; print('{}.{}.{}-{}-{}'.format(*sys.version_info))"

3.7.6-final-0

注意:.format()而不是f-strings或'.'.join()允许您使用任意格式和分隔符字符，例如，使其成为一个可greppable的单字字符串。我把它放在bash实用程序脚本中，报告所有重要的版本:python, numpy, pandas, sklearn, MacOS, xcode, clang, brew, conda, anaconda, gcc/g++等。对日志记录、可复制性、故障排除和错误报告等很有用。

import sys
sys.version.split(' ')[0]

sys。版本给你你想要的，只是选择第一个数字:)

从命令行(注意大写的“V”):

python -V

这在“man python”中有记录。

从IPython控制台

!python -V

只是为了好玩，下面是在CPython 1.0-3.7b2, Pypy, Jython和Micropython上的一种方法。在现代代码中，这更像是一种新奇的做法。我将其作为http://stromberg.dnsalias.org/~strombrg/pythons/的一部分编写，这是一个脚本，用于在多个版本的python上同时测试一段代码，因此您可以轻松地了解哪些python特性与哪些版本的python兼容:

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")