pip安装最后报错提示: cffi.ffiplatform.VerificationError: importing '/usr/lib/python2.7/dist-packages/cryptography/_Cryptography_cffi_813c10e0x7adb75f8.x86_64-linux-gnu.so': /usr/lib/python2.7/dist-packages/cryptography/_Cryptography_cffi_813c10e0x7adb75f8.x86_64-linux-gnu.so: symbol SSLv2_client_method, version OPENSSL_1.0.0 not defined in file libssl.so.1.0.0 with link time reference 解决办法: 安装openssl和libssl ``` apt-get install openssl libssl-dev ```