python 2.7与anaconda安装的3.5冲突解决和升级pip

Error checking for conflicts.
Traceback (most recent call last):
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2897, in _dep_map
    return self.__dep_map
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2691, in __getattr__
    raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2888, in _parsed_pkg_info
    return self._pkg_info
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2691, in __getattr__
    raise AttributeError(attr)
AttributeError: _pkg_info

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:\anaconda3\lib\site-packages\pip\_internal\commands\install.py", line 503, in _warn_about_conflicts
    package_set, _dep_info = check_install_conflicts(to_install)
  File "d:\anaconda3\lib\site-packages\pip\_internal\operations\check.py", line 108, in check_install_conflicts
    package_set, _ = create_package_set_from_installed()
  File "d:\anaconda3\lib\site-packages\pip\_internal\operations\check.py", line 47, in create_package_set_from_installed
    package_set[name] = PackageDetails(dist.version, dist.requires())
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2635, in requires
    dm = self._dep_map
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2899, in _dep_map
    self.__dep_map = self._compute_dependencies()
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2908, in _compute_dependencies
    for req in self._parsed_pkg_info.get_all('Requires-Dist') or []:
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 2890, in _parsed_pkg_info
    metadata = self.get_metadata(self.PKG_INFO)
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 1410, in get_metadata
    value = self._get(self._fn(self.egg_info, name))
  File "d:\anaconda3\lib\site-packages\pip\_vendor\pkg_resources\__init__.py", line 1522, in _get
    with open(path, 'rb') as stream:
FileNotFoundError: [Errno 2] No such file or directory: 'd:\\anaconda3\\lib\\site-packages\\python_twitter-3.5.dist-info\\METADATA'

在安装两个python软件是一定要把python.exe各自定义为python2.7.exe和python3.5，不然windows系统和到环境变量中寻找path一般会以后安装的为主，如图：

然后再用各自的命令安装软件：

2.x：python2 -m pip install numpy

3.5：python35 -m pip install numpy

中间可以会遇到要更新pip：

python2 -m pip install --upgrade pip

python35 -m pip install --upgrade pip

自己搞多了就慢慢会解决了