解决pip 安装失败

转自：http://blog.csdn.net/kevin_darkelf/article/details/49161067

用官方的get-pip.py安装 pip失败, 报类似

InsecurePlatformWarning 
Could not find a version that satisfies the requirement ** (from versions: ) 
No matching distribution found for simpejson

的错, 没有找到具体原因. 
尝试用 easy_install 安装pip , 报错:

Reading https://pypi.python.org/simple/pip/ Download error on 
https://pypi.python.org/simple/pip/: [SSL: CERTIFICATE_VERIFY_FAILED] 
certificate verify failed (_ssl.c:581) – Some packages may not be 
found! Couldn’t find index page for ‘pip’ (maybe misspelled?) Scanning 
index of all packages (this may take a while) Reading 
https://pypi.python.org/simple/ Download error on 
https://pypi.python.org/simple/: [SSL: CERTIFICATE_VERIFY_FAILED] 
certificate verify failed (_ssl.c:581) – Some packages may not be 
found! No local packages or download links found for pip error: Could 
not find suitable distribution for Requirement.parse(‘pip’)

不过, 可以看到原因了, 根据 http://blog.chinaunix.net/uid-26000296-id-4769414.html 的方法 
重新安装curl的证书:

$ wget http://curl.haxx.se/ca/cacert.pem
$ mv cacert.pem ca-bundle.crt
$ sudo cp ca-bundle.crt /etc/pki/tls/certs/

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然后再执行sudo easy_intall pip 就成功了

p.s. 
后来再另一台机器上用pip 装simplejson同样上述失败,然后更新证书, 再安装simplejson 成功