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我试图将 pip 从 9.x 升级到 19.3.1。最初，此回溯仅在发出pip. 现在它在尝试时发生pip list/install/uninstall。我已经尝试了一些东西，包括这里的解决方案： 'pip install' 对每个包都失败（“找不到满足要求的版本”）

这里的 curl 命令也会生成相同的回溯。

我已经尝试过sudo easy_install -U pip，这允许我在没有回溯的情况下运行 pip，但是在尝试列出/安装/卸载时我仍然有回溯。

这是回溯：

Traceback (most recent call last):
  File "<stdin>", line 22318, in <module>
  File "<stdin>", line 198, in main
  File "<stdin>", line 83, in bootstrap
  File "/var/folders/zz/n8qtr4fd7pq4c0wgpswz2xf40000gq/T/tmp4UTKAc/pip.zip/pip/_internal/commands/install.py", line 23, in <module>
  File "/var/folders/zz/n8qtr4fd7pq4c0wgpswz2xf40000gq/T/tmp4UTKAc/pip.zip/pip/_internal/cli/req_command.py", line 20, in <module>
  File "/var/folders/zz/n8qtr4fd7pq4c0wgpswz2xf40000gq/T/tmp4UTKAc/pip.zip/pip/_internal/network/session.py", line 17, in <module>
  File "/var/folders/zz/n8qtr4fd7pq4c0wgpswz2xf40000gq/T/tmp4UTKAc/pip.zip/pip/_vendor/requests/__init__.py", line 97, in <module>
  File "/var/folders/zz/n8qtr4fd7pq4c0wgpswz2xf40000gq/T/tmp4UTKAc/pip.zip/pip/_vendor/urllib3/contrib/pyopenssl.py", line 46, in <module>
  File "/Library/Python/2.7/site-packages/OpenSSL/__init__.py", line 8, in <module>
    from OpenSSL import rand, crypto, SSL
  File "/Library/Python/2.7/site-packages/OpenSSL/rand.py", line 11, in <module>
    from OpenSSL._util import (
  File "/Library/Python/2.7/site-packages/OpenSSL/_util.py", line 6, in <module>
    from cryptography.hazmat.bindings.openssl.binding import Binding
  File "/Library/Python/2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 182, in <module>
    Binding.init_static_locks()
  File "/Library/Python/2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 139, in init_static_locks
    cls._ensure_ffi_initialized()
  File "/Library/Python/2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 134, in _ensure_ffi_initialized
    cls._register_osrandom_engine()
  File "/Library/Python/2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 99, in _register_osrandom_engine
    _openssl_assert(cls.lib, cls.lib.ERR_peek_error() == 0)
  File "/Library/Python/2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 43, in _openssl_assert
    errors
cryptography.exceptions.InternalError: Unknown OpenSSL error. Please file an issue at https://github.com/pyca/cryptography/issues with information on how to reproduce this.

macOS 版本：10.14.6

openssl 版本：LibreSSL 3.0.2（brew 安装并添加到 .zshrc 中的 PATH）

pip 版本：来自 /Library/Python/2.7/site-packages/pip-19.3.1-py2.7.egg/pip (python 2.7) 的 pip 19.3.1

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