如何在 Amazon Linux 实例 (EC2) 上升级 Python 请求模块时克服依赖性问题？答案

【问题标题】：How to overcome dependency issues while upgrading Python Requests Module on Amazon Linux Instance (EC2)?如何在 Amazon Linux 实例 (EC2) 上升级 Python 请求模块时克服依赖性问题？
【发布时间】：2018-12-31 23:41:35
【问题描述】：

我有一个简单的 Flask 应用程序，我尝试在我的新 AWS EC2 实例上运行，如下所示：

FLASK_APP=app.py flask run

我收到以下错误：

  File "/home/ec2-user/my-folder/my-app/my-script.py", line 16, in <module>
    urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
AttributeError: 'module' object has no attribute 'disable_warnings'

我在网上找到的一个建议是升级我的 Python Requests 模块版本。我当前的版本是 1.2.3。

当我尝试升级它时会发生以下情况：

[ec2-user@ip-xxx-xx-xx-xxx my-folder]$ pip install requests --upgrade
Collecting requests
  Using cached https://files.pythonhosted.org/packages/7d/e3/20f3d364d6c8e5d2353c72a67778eb189176f08e873c9900e10c0287b84b/requests-2.21.0-py2.py3-none-any.whl
Collecting chardet<3.1.0,>=3.0.2 (from requests)
  Using cached https://files.pythonhosted.org/packages/bc/a9/01ffebfb562e4274b6487b4bb1ddec7ca55ec7510b22e4c51f14098443b8/chardet-3.0.4-py2.py3-none-any.whl
Collecting idna<2.9,>=2.5 (from requests)
  Using cached https://files.pythonhosted.org/packages/14/2c/cd551d81dbe15200be1cf41cd03869a46fe7226e7450af7a6545bfc474c9/idna-2.8-py2.py3-none-any.whl
Collecting certifi>=2017.4.17 (from requests)
  Using cached https://files.pythonhosted.org/packages/9f/e0/accfc1b56b57e9750eba272e24c4dddeac86852c2bebd1236674d7887e8a/certifi-2018.11.29-py2.py3-none-any.whl
Collecting urllib3<1.25,>=1.21.1 (from requests)
  Using cached https://files.pythonhosted.org/packages/62/00/ee1d7de624db8ba7090d1226aebefab96a2c71cd5cfa7629d6ad3f61b79e/urllib3-1.24.1-py2.py3-none-any.whl
cloud-init 0.7.6 requires argparse, which is not installed.
cloud-init 0.7.6 requires cheetah, which is not installed.
cloud-init 0.7.6 requires oauth, which is not installed.
cloud-init 0.7.6 requires PrettyTable, which is not installed.
cloud-init 0.7.6 requires pyserial, which is not installed.
Installing collected packages: chardet, idna, certifi, urllib3, requests
  Found existing installation: chardet 2.0.1
Cannot uninstall 'chardet'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

您建议如何进行升级？如果 urllib3 问题有更好的解决方法，也请告诉我。

【问题讨论】：

你为什么不使用 virtualenv？

标签： python amazon-web-services amazon-ec2 python-requests

【解决方案1】：

您的代码与 chardet 包的发行版安装冲突，您应该按照@joseph 的建议使用 virtualenv，或者您需要使用包管理器命令删除或更新 chardet 包，如果您使用的是 amazon linux，那么您必须使用以下命令手动删除 chardet 包

yum remove python-chardet

【讨论】：