python 3 / flask - No module named 'MySQLdb' - python-3.x

Question

I am getting an error when i try to GET some data with my flask app:
Traceback (most recent call last):
File "~/server/env/lib/python3.9/site-packages/sqlalchemy/util/_collections.py", line 1008, in __call__
return self.registry[key]
KeyError: 6166425600
this traceback ends with :
File "~/server/env/lib/python3.9/site-packages/sqlalchemy/dialects/mysql/mysqldb.py", line 163, in dbapi
return __import__("MySQLdb")
ModuleNotFoundError: No module named 'MySQLdb'
When i try to pip install mysqlclient ( the recommended fix ), i get :
Collecting mysqlclient
Using cached mysqlclient-2.1.0.tar.gz (87 kB)
Preparing metadata (setup.py) ... error
error: subprocess-exited-with-error
× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [16 lines of output]
/bin/sh: mysql_config: command not found
/bin/sh: mariadb_config: command not found
/bin/sh: mysql_config: command not found
Traceback (most recent call last):
File "<string>", line 2, in <module>
File "<pip-setuptools-caller>", line 34, in <module>
File "/private/var/folders/j5/b194wjbn32sbqct7crpvcp2w0000gn/T/pip-install-ijejonzz/mysqlclient_841539cf1eed4511a135f8e95cb2be75/setup.py", line 15, in <module>
metadata, options = get_config()
File "/private/var/folders/j5/b194wjbn32sbqct7crpvcp2w0000gn/T/pip-install-ijejonzz/mysqlclient_841539cf1eed4511a135f8e95cb2be75/setup_posix.py", line 70, in get_config
libs = mysql_config("libs")
File "/private/var/folders/j5/b194wjbn32sbqct7crpvcp2w0000gn/T/pip-install-ijejonzz/mysqlclient_841539cf1eed4511a135f8e95cb2be75/setup_posix.py", line 31, in mysql_config
raise OSError("{} not found".format(_mysql_config_path))
OSError: mysql_config not found
mysql_config --version
mariadb_config --version
mysql_config --libs
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed
not sure what else to do, outside of the pip install.

Answer 1

Do you have MySQL installed on your machine? Pip is only going to install the python connector, and it is failing because it cannot find MySQL or MariaDB installed locally.