Python：在pipenv中的pip3安装请求之后没有名为'requests'的模块

Question

我正在尝试使用Python 3在pipenv中安装库请求。我尝试过：

1. pip install requests，在忘记pip仅安装Python 2之前，导致，
2. pip3 install requests，肯定地返回

---

Requirement already satisfied: requests in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (2.19.1)
Requirement already satisfied: idna<2.8,>=2.5 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests) (2.7)
Requirement already satisfied: urllib3<1.24,>=1.21.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests) (1.23)
Requirement already satisfied: certifi>=2017.4.17 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests) (2018.8.24)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from requests) (3.0.4)

当我用import requests运行我的python文件时，一切正常，但是当我运行pipenv run python mypythonscript.py时，我得到错误ModuleNotFoundError: No module named 'requests'。请告知我缺少的东西。

Answer 1

这里的问题是pip3 install requests在pipenv的virtualenv之外运行，它安装在virtualenv之外，因此在virtualenv中运行的代码中找不到requests库。

将库安装到virtualenv中的正确方法是pipenv install requests，它还会将requests添加到您的Pipfile中。如果要暂时安装它而不保存到Pipfile中，可以运行pipenv run pip install requests。