Question

我正在寻找一种方法来测试用Python 3.6开发的代码是否将与Python 2.7兼容。理想情况下-如果不是，我希望以某种方式指出无效的语法。谢谢

Answer 1

是的。使用python2.7 yourScript.py执行代码。如果某些模块需要python3。*，则可以仅为python2.7编写第二个脚本？ hacky，但这是快速而懒惰的解决方案。

您绝对应该在启动时检查版本。此代码段会使用正确的版本自动重新启动脚本：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# pythonVersionCheck.py

import sys
import os

# Color codes for output
CRED = '\033[91m'
CGREEN = '\033[92m'
CEND = '\033[0m'

# Desired python version number
scriptVersion = "3.6"

# Check if script is executed with root. Get rid of this block if you don't need it
if os.geteuid() != 0:
    print(CRED + "\nRestart the script with root privileges: 'sudo python" 
    + scriptVersion + " " + sys.argv[0] + "'\n" + CEND)
    sys.exit(0)

# Check if the script is running with the desired python version
if sys.version[:3] == scriptVersion:
    print(CGREEN + "Script running with Python " + scriptVersion + CEND)
else:
    print(CRED + "Script not running with Python " + scriptVersion + ". Restarting." + CEND)
    try:
         os.execv(sys.executable, ['python' + scriptVersion] + sys.argv)
    except OSError as error:
        print(CRED + "An error occured: " + str(error) + CEND)

# YOUR CODE HERE

阅读Python2。*和Python3。* here之间的可移植性。

编辑：根据@MisterMiyagi的建议，此处有一些更改。

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# pythonVersionCheck.py

import sys
import subprocess
import platform

# Desired python version number
scriptVersion = "2.7"
usedVersion = "{0}.{1}".format(sys.version_info.major,sys.version_info.minor)
opSys = platform.system()

# Check if the script is running with the desired python version
if usedVersion == scriptVersion:
    print("Script running with Python " + scriptVersion)
else:
    print("Script not running with Python " + scriptVersion + ". Restarting.")
    if opSys == 'Linux' or opSys == 'Darwin':
        subprocess.call('python' + scriptVersion + ' ' + sys.path[0] + '/' +
        sys.argv[0], shell=True)
    elif opSys is 'Windows':
        print("py -" + scriptVersion + ' ' + sys.argv[0])
        subprocess.call("py -" + scriptVersion + ' ' + sys.argv[0], shell=True)
    else:
        print("Can't detect os.")

# YOUR CODE HERE

它现在使用subprocess而不是os.execv。现在，它使用sys.version_info而不是sys.version。现在，它可以检查用户运行的平台，因此可以移植到Linux，Windows和Appletoshwin。

有没有一种简单的方法来检查我的python 3.6脚本是否与python 2.7兼容？

1 个答案: