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-develpython-devel 或ubuntu中
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
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