I just installed pip in the windows environment on the machine to use it later when installing the package. Who knows that the first time I use pip to install asyncio, I get an error.

When using pip installation package under Windows 7×64, it prompts an error: Microsoft Visual C++ 9.0 is required (Unable to find vcvarsall.bat)

Environment: windows7 x64, python2.7, VS2012

The reason: the windows when using pip installation package requires a machine equipped with vs2008, VS2012 does not work, you do not want VS2008 installed, you can install a Micorsoft Visual C ++ Compiler for Python 2.7 packages