有关建立虚拟环境的总结

1   创建虚拟环境 virtualenv
    - --安装# pip intall virtualenv
2  --- 进入要创建虚拟环境目录下：

# cd :d #cd virtualenvs
3  ----创建虚拟环境，创建【环境名称】文件夹，放置所有环境变量
# virtualenv 项目名称 --python=Python3.6
--python=Python27.exe
--python='C:PythonPython36python.exe
4  ---激活虚拟环境和退出虚拟环境
# 进入 虚拟环境目录： cd trace
# 进入 scripts目录 ：cd scripts
# activate
5  出现（项目名称）：的标准就是表示激活成功
----虚拟环境安装django
python3.7 和django1.11.7 不兼容 .可以安装 django.1.11.28
6    执行： pip install django==1.11.7
----搭建django环境
提醒:先去创建虚拟环境

7  创建django项目

    django-admin startproject  applet 

8 创建 app

  cd   applet 

python manage.py  startappp  myapp 

 注意事项： 在创建APP可能出现

解决办法：修改指定路径下的functools.py文件的def total_ordering(cls):方法：

原来的样子：

convert = {
        '__lt__': [('__gt__', lambda self, other: other < self),
                   ('__le__', lambda self, other: not other < self),
                   ('__ge__', lambda self, other: not self < other)],
        '__le__': [('__ge__', lambda self, other: other <= self),
                   ('__lt__', lambda self, other: not other <= self),
                   ('__gt__', lambda self, other: not self <= other)],
        '__gt__': [('__lt__', lambda self, other: other > self),
                   ('__ge__', lambda self, other: not other > self),
                   ('__le__', lambda self, other: not self > other)],
        '__ge__': [('__le__', lambda self, other: other >= self),
                   ('__gt__', lambda self, other: not other >= self),
                   ('__lt__', lambda self, other: not self >= other)]
    }

修改后的样子：

convert = {  
    '__lt__': [('__gt__', lambda self, other: not (self < other or self == other)),  
               ('__le__', lambda self, other: self < other or self == other),  
               ('__ge__', lambda self, other: not self < other)],  
    '__le__': [('__ge__', lambda self, other: not self <= other or self == other),  
               ('__lt__', lambda self, other: self <= other and not self == other),  
               ('__gt__', lambda self, other: not self <= other)],  
    '__gt__': [('__lt__', lambda self, other: not (self > other or self == other)),  
               ('__ge__', lambda self, other: self > other or self == other),  
               ('__le__', lambda self, other: not self > other)],  
    '__ge__': [('__le__', lambda self, other: (not self >= other) or self == other),  
               ('__gt__', lambda self, other: self >= other and not self == other),  
               ('__lt__', lambda self, other: not self >= other)]  
}

改完之后即可创建app