Python2的一些问题及解决办法

1. 无法注释中文的解决办法

# -*- coding:utf8 -*-    # 添加这一行就行了

from django.contrib import admin
from myapp.models import *    # 尽量不用用星号，这里就不改了
# Register your models here.
# admin.site.register(Member)   # Django默认后台样式

在py文件添加

2. 无法显示中文的问题

import sys
reload(sys)
sys.setdefaultencoding('utf8')

摘自：
    http://blog.csdn.net/crazyhacking/article/details/39375535

引入sys模块

3. 解决版本兼容问题

from __future__ import unicode_literals

摘自：
http://python-future.org/unicode_literals.html

导入__future__模块

4. 当安装第三方库的时候出现Python version 2.7 required, which was not found in the registry

#!C:/Python27/python2.exe
import sys

from _winreg import *

# tweak as necessary
version = sys.version[:3]
installpath = sys.prefix

regpath = "SOFTWARE\\Python\\Pythoncore\\%s\\" % (version)
installkey = "InstallPath"
pythonkey = "PythonPath"
pythonpath = "%s;%s\\Lib\\;%s\\DLLs\\" % (
    installpath, installpath, installpath
)

def RegisterPy():
    try:
        reg = OpenKey(HKEY_CURRENT_USER, regpath)
    except EnvironmentError as e:
        try:
            reg = CreateKey(HKEY_CURRENT_USER, regpath)
            SetValue(reg, installkey, REG_SZ, installpath)
            SetValue(reg, pythonkey, REG_SZ, pythonpath)
            CloseKey(reg)
        except:
            print "*** Unable to register!"
            return
        print "--- Python", version, "is now registered!"
        return
    if (QueryValue(reg, installkey) == installpath and
            QueryValue(reg, pythonkey) == pythonpath):
        CloseKey(reg)
        print "=== Python", version, "is already registered!"
        return
    CloseKey(reg)
    print "*** Unable to register!"
    print "*** You probably have another Python installation!"

if __name__ == "__main__":
    RegisterPy()

摘自：
http://blog.csdn.net/zklth/article/details/8117207

建立一个register.py文件，然后python2执行脚本

5. 安装Python2之后，pip不能用的问题，如pip -V ，会报如下的错误

# 解释器为Python2.7.14，win10企业版，Python2和3共存
# 在安装完解释器之后，cmd窗口执行：pip2 list或者pip2 -V会报如下错误：

Fatal error in launcher: Unable to create process using '"'

解决办法为
用Python2解释器cmd执行如下命令:

python2 -m pip install --upgrade pip

就好了

摘自：
http://blog.csdn.net/yu757371316/article/details/54962305

Python多版本共存添加环境变量：
http://www.cnblogs.com/Neeo/p/8393805.html

解决办法

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