树莓派安装pyrebase遇AttributeError：lib无X509_V_FLAG_CB_ISSUER_CHECK属性

这个错误根源是pyOpenSSL版本与树莓派系统自带libssl库不兼容，直接修改crypto.py的临时hack无法解决pip启动阶段的依赖加载问题，以下是可行的修复步骤：

步骤1：卸载冲突的pyOpenSSL版本 #

先移除通过pip安装的pyOpenSSL，避免与系统包冲突：

sudo pip3 uninstall pyOpenSSL -y

步骤2：安装系统适配的pyOpenSSL #

使用apt安装树莓派官方维护的python3-openssl包，确保与系统libssl完全兼容：

sudo apt-get update && sudo apt-get install python3-openssl -y

步骤3：重新安装pyrebase #

用--no-deps参数避免pyrebase自动安装冲突依赖：

sudo pip3 install pyrebase --no-deps

备选方案：升级pip后重试 #

若上述方法无效，先升级pip和setuptools再重新安装：

sudo pip3 install --upgrade pip setuptools
sudo pip3 install pyrebase

完整错误栈 #

raspi@raspberrypi:~ $ sudo pip3 install pyrebase Traceback (most recent call last): File "/usr/bin/pip3", line 33, in sys.exit(load_entry_point('pip==20.3.4', 'console_scripts', 'pip3')()) File "/usr/bin/pip3", line 25, in importlib_load_entry_point return next(matches).load() File "/usr/lib/python3.9/importlib/metadata.py", line 77, in load module = import_module(match.group('module')) File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1030, in _gcd_import File "<frozen importlib._bootstrap>", line 1007, in _find_and_load File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 680, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 790, in exec_module File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed File "/usr/lib/python3/dist-packages/pip/_internal/cli/main.py", line 10, in <module> from pip._internal.cli.autocompletion import autocomplete File "/usr/lib/python3/dist-packages/pip/_internal/cli/autocompletion.py", line 9, in <module> from pip._internal.cli.main_parser import create_main_parser File "/usr/lib/python3/dist-packages/pip/_internal/cli/main_parser.py", line 7, in <module> from pip._internal.cli import cmdoptions File "/usr/lib/python3/dist-packages/pip/_internal/cli/cmdoptions.py", line 23, in <module> from pip._vendor.packaging.utils import canonicalize_name File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 94, in <module> vendored("requests.packages.urllib3.contrib.pyopenssl") File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 36, in vendored __import__(modulename, globals(), locals(), level=0) File "<frozen importlib._bootstrap>", line 1007, in _find_and_load File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 664, in _load_unlocked File "<frozen importlib._bootstrap>", line 627, in _load_backward_compatible File "<frozen importlib._bootstrap>", line 259, in load_module File "/usr/share/python-wheels/urllib3-1.26.5-py2.py3-none-any.whl/urllib3/contrib/pyopenssl.py", line 50, in <module> File "/usr/lib/python3/dist-packages/OpenSSL/__init__.py", line 8, in <module> from OpenSSL import crypto, SSL File "/usr/lib/python3/dist-packages/OpenSSL/crypto.py", line 1556, in <module> class X509StoreFlags(object): File "/usr/lib/python3/dist-packages/OpenSSL/crypto.py", line 1577, in X509StoreFlags CB_ISSUER_CHECK = _lib.X509_V_FLAG_CB_ISSUER_CHECK AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK'

内容的提问来源于stack exchange，提问作者Damandroid