为什么我的模块没有安装在我当前的 python 环境中？

Question

I have a recurrent problem I have yet been unable to find an answer to.
Whenever I install a package in PyCharm through the terminal, whenever I try importing the module the package appears to not be installed. Or, like just now, the package may already be installed but when importing the module I get the error "No module named x" :

C:\Users\TimStack\PycharmProjects\API>pip install requests
Requirement already satisfied: requests in c:\users\TimStack\appdata\local\programs\python\python37\lib\site-packages (2.23.0)
Requirement already satisfied: certifi>=2017.4.17 in c:\users\TimStack\appdata\local\programs\python\python37\lib\site-packages (from requests) (2019.11.28)
Requirement already satisfied: idna<3,>=2.5 in c:\users\TimStack\appdata\local\programs\python\python37\lib\site-packages (from requests) (2.9)
Requirement already satisfied: chardet<4,>=3.0.2 in c:\users\TimStack\appdata\local\programs\python\python37\lib\site-packages (from requests) (3.0.4)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\users\TimStack\appdata\local\programs\python\python37\lib\site-packages (from requests) (1.25.8)

Looking at these directories, it seems to refer to an old Python 3.7 installation. However, my environment uses 3.8 .

What's the issue at hand here, and how do I go about solving it?

Answer 1

You need to uninstall the old 3.7 version as you have 2 conflicting Python versions.

OR

Specify your Python version when installing packages:

pip3.8 install [package name]

(3.8 for Python 3.8)

Answer 2

pip install takes --python-version <python_version> as argument. You can pass 3.8 as argument and it will pick up the right one for you.

from the docs -

The Python interpreter version to use for wheel and "Requires- Python" compatibility checks. Defaults to a version derived from the running interpreter. The version can be specified using up to three dot-separated integers (eg "3" for 3.0.0, "3.7" for 3.7.0, or "3.7.3"). A major-minor version can also be given as a string without dots (eg "37" for 3.7.0).