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为 python2.7 安装 pip 时出现此错误：

$python get-pip.py

Collecting pip
  Downloading pip-8.1.1-py2.py3-none-any.whl (1.2MB)
    100% |????????????????????????????????| 1.2MB 294kB/s 
Collecting setuptools
  Downloading setuptools-20.6.7-py2.py3-none-any.whl (508kB)
    100% |????????????????????????????????| 512kB 504kB/s 
Collecting wheel
  Downloading wheel-0.29.0-py2.py3-none-any.whl (66kB)
    100% |????????????????????????????????| 71kB 403kB/s 
Installing collected packages: pip, setuptools, wheel
Exception:
Traceback (most recent call last):
  File "/tmp/tmpCmiLCu/pip.zip/pip/basecommand.py", line 209, in main
    status = self.run(options, args)
  File "/tmp/tmpCmiLCu/pip.zip/pip/commands/install.py", line 317, in run
    prefix=options.prefix_path,
  File "/tmp/tmpCmiLCu/pip.zip/pip/req/req_set.py", line 732, in install
    **kwargs
  File "/tmp/tmpCmiLCu/pip.zip/pip/req/req_install.py", line 835, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File …