ERROR: pyopenssl 19.0.0 has requirement cryptography=2.3, but you'll have cryptography 2.1.4 which

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原因：版本太低，安装就好了。

ERROR: pyopenssl 19.0.0 has requirement cryptography>=2.3, but you'll have cryptography 2.1.4 which is incompatible.
Installing collected packages: ldap3, hyperframe, click, zstandard, protobuf, ruamel.yaml.clib, ruamel.yaml, hpack, h2, pyperclip, publicsuffix2, urwid, pydivert, blinker, h11, wsproto, pyparsing, Jinja2, Werkzeug, flask, passlib, sortedcontainers, kaitaistruct, certifi, pyOpenSSL, Brotli, mitmproxyFound existing installation: click 6.7Uninstalling click-6.7:Successfully uninstalled click-6.7Found existing installation: pyparsing 2.2.0Uninstalling pyparsing-2.2.0:Successfully uninstalled pyparsing-2.2.0Found existing installation: Jinja2 2.10Uninstalling Jinja2-2.10:Successfully uninstalled Jinja2-2.10Found existing installation: Werkzeug 0.14.1Uninstalling Werkzeug-0.14.1:Successfully uninstalled Werkzeug-0.14.1Found existing installation: Flask 1.0.2Uninstalling Flask-1.0.2:Successfully uninstalled Flask-1.0.2Found existing installation: certifi 2018.4.16Uninstalling certifi-2018.4.16:Successfully uninstalled certifi-2018.4.16Found existing installation: pyOpenSSL 17.5.0Uninstalling pyOpenSSL-17.5.0:

下载：https://pypi.org/simple/pyopenssl/

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