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安装PIL的时候遇到个问题，

pip install PIL

Downloading/unpacking PIL

Could not find any downloads that satisfy the requirement PIL

Some externally hosted files were ignored (use --allow-external PIL to allow).

Cleaning up...

No distributions at all found for PIL

Storing debug log for failure in pip.log

环境：

OS：Win7-64bit

Python：2.7.9

解决办法：

pip install PIL --allow-external PIL --allow-unverified PIL

效果：

--------------------------------------------------------------------

PIL 1.1.7 SETUP SUMMARY

--------------------------------------------------------------------

version 1.1.7

platform win32 2.7.9 (default, Dec 10 2014, 12:24:55)

[MSC v.1500 32 bit (Intel)]

--------------------------------------------------------------------

*** TKINTER support not available (Tcl/Tk 8.5 libraries needed)

*** JPEG support not available

*** ZLIB (PNG/ZIP) support not available

*** FREETYPE2 support not available

*** LITTLECMS support not available

--------------------------------------------------------------------

To add a missing option, make sure you have the required

library, and set the corresponding ROOT variable in the

setup.py script.

To check the build, run the selftest.py script.

Successfully installed PIL

Cleaning up...

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原文地址：http://my.oschina.net/u/921876/blog/406374