ModuleNotFoundError：即使已安装，也没有名为“flask_mysqldb”的模块

Question

I'm using mysql with flask for developing a basic website and I'm getting ModuleNotFound error even if I have the module installed. Can someone solve this?

  File "c:/Users/prshi/Desktop/Py files/FLASK app/app.py", line 3, in <module>
    from flask_mysqldb import MySQL
ModuleNotFoundError: No module named 'flask_mysqldb'
PS C:\Users\prshi\Desktop\Py files\FLASK app> pip install flask-mysqldb
Requirement already satisfied: flask-mysqldb in c:\python39\lib\site-packages (0.2.0)
Requirement already satisfied: Flask>=0.10 in c:\python39\lib\site-packages (from flask-mysqldb) (1.1.2)
Requirement already satisfied: mysqlclient in c:\python39\lib\site-packages (from flask-mysqldb) (1.4.6)
Requirement already satisfied: Werkzeug>=0.15 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (1.0.1)
Requirement already satisfied: Jinja2>=2.10.1 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (2.11.2)
Requirement already satisfied: itsdangerous>=0.24 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (1.1.0)
Requirement already satisfied: click>=5.1 in c:\python39\lib\site-packages (from Flask>=0.10->flask-mysqldb) (7.1.2)
Requirement already satisfied: MarkupSafe>=0.23 in c:\python39\lib\site-packages (from Jinja2>=2.10.1->Flask>=0.10->flask-mysqldb) (1.1.1)
PS C:\Users\prshi\Desktop\Py files\FLASK app> 

Answer 1

This a common python path issue, to make sure it isn't your case, type:

import sys
print(sys.path)

and check if it contains:

/usr/local/lib64/python3.6/site-packages

The problem is that you install the package using pip somewhere, and you're trying to import it from somewhere else where it's not installed. The trick to solve it is by running this command:

export PYTHONPATH=$PYTHONPATH:/path/to/your/modules