pip 安装python模块常见错误

1.报错：

c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory

     #include <ffi.h>

                     ^

    compilation terminated.

    error: command 'gcc' failed with exit status 1

yum install -y libffi-devel  python-devel

apt-get install -y libffi-dev python-dev libevent-dev

2.报错：build/temp.linux-x86_64-3.4/_openssl.c:423:30: fatal error: openssl/opensslv.h: No such file or directory

   apt-get install libssl-dev