pip install 提示"no previously-included directories found matching"及"no previously-included files matching found anywhere in distribution"，且偶发无法关联安装 PyPI 库的故障

环境描述：

Python 2.7.5

CentOS-7.2

 

报错现象：

(1).在虚拟环境下运行 pip install 命令安装 PyPI 第三方库，出现类似如下告警。

Running setup.py egg_info for package Werkzeug

    no previously-included directories found matching 'docs/_build'

    no previously-included directories found matching 'docs/_themes'

    warning: no previously-included files matching '*.py[cdo]' found anywhere in distribution

    warning: no previously-included files matching '__pycache__' found anywhere in distribution

    warning: no previously-included files matching '*.so' found anywhere in distribution

(2).偶发无法关联安装 PyPI 库的故障。

例如：安装 python-daemon (2.1.2) 需要先安装 docutils (0.14) 及 lockfile (0.12.2)。而故障发生时，无法自动安装关联 PyPI 库。

(3).检查虚拟环境 pip 版本，发现版本较低。

例如：虚拟环境下 pip 版本为 1.4.1，非虚拟环境下 pip 版本为 9.0.1。

 

报错原因：

pip 版本过低，导致安装报错。

 

报错处理方法：

升级 pip 工具，语句类似如下。

#> pip install pip==9.0.1

随后，可通过 pip list 命令进行检查。

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