Ubuntu 16 安装 python 依赖出现 error:

问题

在 Ubuntu 下安装 python 依赖的时候出现以下错误

build/temp.linux-i686-3.5/_openssl.c:498:30: fatal error: openssl/opensslv.h: No such file or directory
  compilation terminated.
  error: command 'i686-linux-gnu-gcc' failed with exit status 1
  
  ----------------------------------------
  Failed building wheel for cryptography
  Running setup.py clean for cryptography
Failed to build cryptography



i686-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include/python3.5m -c build/temp.linux-i686-3.5/_openssl.c -o build/temp.linux-i686-3.5/build/temp.linux-i686-3.5/_openssl.o -Wconversion -Wno-error=sign-conversion
    build/temp.linux-i686-3.5/_openssl.c:498:30: fatal error: openssl/opensslv.h: No such file or directory
    compilation terminated.
    error: command 'i686-linux-gnu-gcc' failed with exit status 1
    
    ----------------------------------------
Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-rbtstpsj/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-1vor2x2o-record/install-record.txt --single-version-externally-managed --compile --user --prefix=" failed with error code 1 in /tmp/pip-build-rbtstpsj/cryptography/

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解决办法

执行

apt install python3 python-dev python3-dev \
      build-essential libssl-dev libffi-dev \
      libxml2-dev libxslt1-dev zlib1g-dev \
      python-pip

系统的包安装完之后，即可正常安装 python 依赖

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