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")

sys。Version_info在3.7时似乎没有返回元组。相反，它返回一个特殊的类，因此使用元组的所有示例都不起作用，至少对我来说是这样。下面是python控制台的输出:

>>> import sys
>>> type(sys.version_info)
<class 'sys.version_info'>

我发现使用sys.version_info的组合。Major和sys.version_info。小调似乎就足够了。例如,……

import sys
if sys.version_info.major > 3:
    print('Upgrade to Python 3')
    exit(1)

检查是否运行Python 3。你甚至可以用…

import sys
ver = sys.version_info
if ver.major > 2:
    if ver.major == 3 and ver.minor <= 4:
        print('Upgrade to Python 3.5')
        exit(1)

可以检查你是否至少运行Python 3.5。

尝试使用os。Popen在变量中读取它:

import os
ver = os.popen('python -V').read().strip()
print(ver)

有六个模块，你可以做到:

import six

if six.PY2:
  # this is python2.x
else:
  # six.PY3
  # this is python3.x

在Windows操作系统下，通过在命令提示符中输入以下命令，验证命令的Python版本

c:\>python -V
Python 2.7.16

c:\>py -2 -V
Python 2.7.16

c:\>py -3 -V
Python 3.7.3

此外，要查看每个Python版本的文件夹配置，请运行以下命令:

For Python 2,'py -2 -m site'
For Python 3,'py -3 -m site'

这只返回2.7 3.6或3.9

import sys
current_version = ".".join(map(str, sys.version_info[0:2]))

这是你通常需要的…