Looking in indexes: https://pypi.doubanio.com/simple Requirement already satisfied: cryptography in /usr/lib64/python2.7/site-packages (2.1) Requirement already satisfied: idna>=2.1 in /root/.local/lib/python2.7/site-packages (from cryptography) (2.8) Requirement already satisfied: cffi>=1.7; platform_python_implementation != "PyPy" in /usr/lib64/python2.7/site-packages (from cryptography) (1.12.3) Requirement already satisfied: enum34; python_version < "3" in /usr/lib/python2.7/site-packages (from cryptography) (1.1.6) Requirement already satisfied: six>=1.4.1 in /usr/lib/python2.7/site-packages (from cryptography) (1.12.0) Requirement already satisfied: asn1crypto>=0.21.0 in /usr/lib/python2.7/site-packages (from cryptography) (0.24.0) Requirement already satisfied: ipaddress; python_version < "3" in /usr/lib/python2.7/site-packages (from cryptography) (1.0.22) Requirement already satisfied: pycparser in /usr/lib/python2.7/site-packages (from cffi>=1.7; platform_python_implementation != "PyPy"->cryptography) (2.19)