关于 pip安装的可能错误的排除

转载地址：http://www.cnblogs.com/botoo/p/7410316.html

今天安装wheel和lxml总是报错（下为错误信息）

C:\Python27\Scripts>pip install wheel

Collecting wheel
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after
tion broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.or
rt=443): Read timed out. (read timeout=15)",)': /simple/wheel/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after
tion broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.or
rt=443): Read timed out. (read timeout=15)",)': /simple/wheel/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after
tion broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.or
rt=443): Read timed out. (read timeout=15)",)': /simple/wheel/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after
tion broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.or
rt=443): Read timed out. (read timeout=15)",)': /simple/wheel/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after
tion broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.python.or
rt=443): Read timed out. (read timeout=15)",)': /simple/wheel/
  Could not find a version that satisfies the requirement wheel (from vers
)

No matching distribution found for wheel

可以解决问题的解决方法：

此情况只用于网络不畅的安装模块背景：

总出现红色的

Could not find a version that satisfies the requirement pymongo(from version:)

你可能会遇到下面这样的情况：

是因为网络的问题，要使用国内的镜像源来加速

解决办法：

你需要的是在你的命令行下面添加一句

例如：原本执行的命令是：

pip install wheel

改为：

pip install wheel -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

结果会就成功：

ok！问题解决！