Python 2.7 已安装Python pip，但未安装virtualenv

当我输入pip时，它会给我以下错误

C:\Users\DJ PC>pip<br>
Traceback (most recent call last):<br>
  File "C:\Python27\lib\runpy.py",<br>
    "__main__", fname, loader, pkg_<br>
  File "C:\Python27\lib\runpy.py",<br>
    exec code in run_globals<br>
  File "C:\Python27\Scripts\pip.exe<br>
  File "C:\Python27\pip.py", line 1<br>
    bootstrap(tmpdir=tmpdir)<br>
  File "C:\Python27\pip.py", line 1<br>
    cert.write(pkgutil.get_data("pi<br>
  File "C:\Python27\lib\pkgutil.py"<br>
    loader = get_loader(package)<br>
  File "C:\Python27\lib\pkgutil.py"<br>
    return find_loader(fullname)<br>
  File "C:\Python27\lib\pkgutil.py"<br>
    for importer in iter_importers(<br>
  File "C:\Python27\lib\pkgutil.py"<br>
    __import__(pkg)<br>
ImportError: No module named _vendo<br>

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我想用pip在我的电脑上安装virtualenv

单独运行pip是没有意义的 您应该运行：pip安装virtualenv