今日使用pip list,出现一堆错误：

Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 134, in main
    status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip/commands/list.py", line 80, in run
    self.run_listing(options)
  File "/Library/Python/2.7/site-packages/pip/commands/list.py", line 127, in run_listing
    self.output_package_listing(installed_packages)
  File "/Library/Python/2.7/site-packages/pip/commands/list.py", line 136, in output_package_listing
    if dist_is_editable(dist):
  File "/Library/Python/2.7/site-packages/pip/util.py", line 347, in dist_is_editable
    req = FrozenRequirement.from_dist(dist, [])
  File "/Library/Python/2.7/site-packages/pip/__init__.py", line 194, in from_dist
    assert len(specs) == 1 and specs[0][0] == '=='
AssertionError

使用下面命令更新pip自己：

sudo -H pip install --upgrade pip
sudo -H pip install --upgrade setuptools
sudo pip install --upgrade distribute

问题解决。

安装新包：

pip install PackageName

检查更新：

pip list --outdated

更新包：

pip install --upgrade PackageName

卸载包：

pip uninstall PackageName