python安装报错类型_解决Python安装cryptography报错问题

解决Python安装cryptography报错问题

错误一：

gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/usr/include/python2.7 -c c/_cffi_backend.c -o build/temp.linux-x86_64-2.7/c/_cffi_backend.o

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

compilation terminated.

error: command 'gcc' failed with exit status 1

原因：

缺少头文件和静态库包

解决方法：

sudo apt-get install libffi-dev

错误二：

gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c build/temp.linux-x86_64-2.7/_openssl.c -o build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7/_openssl.o -Wconversion -Wno-error=sign-conversion

build/temp.linux-x86_64-2.7/_openssl.c:28:20: fatal er