报错：ModuleNotFoundError: No module named '_ctypes'

报错背景：

CentOS 7

Python3.7

安装 setuptools 插件的时候报错。

报错现象：

[root@master setuptools-41.0.]# python3. setup.py build
Traceback (most recent call last):
  File "setup.py", line , in <module>
    import setuptools
  File "/bigdata/sources/python/setuptools-41.0.1/setuptools/__init__.py", line , in <module>
    from setuptools.dist import Distribution, Feature
  File "/bigdata/sources/python/setuptools-41.0.1/setuptools/dist.py", line , in <module>
    from setuptools import windows_support
  File "/bigdata/sources/python/setuptools-41.0.1/setuptools/windows_support.py", line , in <module>
    import ctypes
  File "/usr/local/python3.7/lib/python3.7/ctypes/__init__.py", line , in <module>
    from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'
[root@master setuptools-41.0.]#

报错原因：

不明

报错解决：

下载 libffi-devel-3.0.13-18.el7.x86_64.rpm 并安装

下载地址：https://centos.pkgs.org/7/centos-x86_64/libffi-devel-3.0.13-18.el7.x86_64.rpm.html

安装libffi-devel：　　rpm -ivh libffi-devel-3.0.13-18.el7.x86_64.rpm

进入setuptools：　　cd setuptools-41.0.1/

安装setuptools：　　python setup.py install