安装camelot-py后运行boto3脚本出现AttributeError问题求助

问题背景 #

安装camelot-py包后，运行boto3脚本触发以下错误：

AttributeError: module 'lib' has no attribute 'X509_V_FLAG_NOTIFY_POLICY'

已尝试升级pyopenssl和cryptography，但错误未消除。当前相关依赖版本：

• boto3 = 1.26.138
• cryptography = 2.1.4
• pyOpenSSL = 17.5.0

完整报错堆栈：

Traceback (most recent call last):
  File "/home/forge/scripts/cgi-scripts/check_boto.py", line 1, in <module>
    import boto3
  File "/usr/local/lib/python3.10/dist-packages/boto3/__init__.py", line 17, in <module>
    from boto3.session import Session
  File "/usr/local/lib/python3.10/dist-packages/boto3/session.py", line 17, in <module>
    import botocore.session
  File "/usr/local/lib/python3.10/dist-packages/botocore/session.py", line 26, in <module>
    import botocore.client
  File "/usr/local/lib/python3.10/dist-packages/botocore/client.py", line 15, in <module>
    from botocore import waiter, xform_name
  File "/usr/local/lib/python3.10/dist-packages/botocore/waiter.py", line 18, in <module>
    from botocore.docs.docstring import WaiterDocstring
  File "/usr/local/lib/python3.10/dist-packages/botocore/docs/__init__.py", line 15, in <module>
    from botocore.docs.service import ServiceDocumenter
  File "/usr/local/lib/python3.10/dist-packages/botocore/docs/service.py", line 14, in <module>
    from botocore.docs.client import ClientDocumenter, ClientExceptionsDocumenter
  File "/usr/local/lib/python3.10/dist-packages/botocore/docs/client.py", line 17, in <module>
    from botocore.docs.example import ResponseExampleDocumenter
  File "/usr/local/lib/python3.10/dist-packages/botocore/docs/example.py", line 13, in <module>
    from botocore.docs.shape import ShapeDocumenter
  File "/usr/local/lib/python3.10/dist-packages/botocore/docs/shape.py", line 19, in <module>
    from botocore.utils import is_json_value_header
  File "/usr/local/lib/python3.10/dist-packages/botocore/utils.py", line 37, in <module>
    import botocore.httpsession
  File "/usr/local/lib/python3.10/dist-packages/botocore/httpsession.py", line 45, in <module>
    from urllib3.contrib.pyopenssl import (
  File "/usr/local/lib/python3.10/dist-packages/urllib3/contrib/pyopenssl.py", line 50, in <module>
    import OpenSSL.crypto
  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 1550, in <module>
    class X509StoreFlags(object):
  File "/usr/lib/python3/dist-packages/OpenSSL/crypto.py", line 1568, in X509StoreFlags
    NOTIFY_POLICY = _lib.X509_V_FLAG_NOTIFY_POLICY
AttributeError: module 'lib' has no attribute 'X509_V_FLAG_NOTIFY_POLICY'. Did you mean: 'X509_V_FLAG_EXPLICIT_POLICY'?

解决方法 #

1. 修复依赖版本冲突 #

你的pyOpenSSL=17.5.0和cryptography=2.1.4版本过旧，且与系统OpenSSL库不兼容。X509_V_FLAG_NOTIFY_POLICY是较新版本OpenSSL才有的常量，旧版本绑定库不支持该字段，导致报错。

2. 强制更新兼容版本 #

执行以下命令更新到兼容的依赖版本：

pip install --upgrade pyOpenSSL>=23.0.0 cryptography>=40.0.0

注：多Python环境下需用对应环境的pip（如pip3）执行。

3. 处理系统级OpenSSL冲突 #

若更新后仍报错，可能是系统全局OpenSSL版本过低：

• 以Ubuntu为例，升级系统OpenSSL：

sudo apt update && sudo apt install --only-upgrade openssl

• 使用虚拟环境隔离依赖：创建新虚拟环境，重新安装boto3和camelot-py，避免系统预装库干扰。

4. 验证修复 #

运行以下测试脚本确认问题解决：

import boto3
s3 = boto3.client('s3')
print("boto3导入成功")

内容的提问来源于stack exchange，提问作者Ajay dev