Answers for "assert mpl_data_dir, "Failed to determine matplotlib's data directory!" AssertionError: Failed to determine matplotlib's data directory!"

assert mpl_data_dir, "Failed to determine matplotlib's data directory!" AssertionError: Failed to determine matplotlib's data directory!

1) Go to the folder where pyinstaller is installed.
2) Go to the hooks folder.
3) Locate and open hook-matplotlib.py file.
4) Delete the PyInstaller import and then import matplotlib.
5) change the exec_statement() function to matplotlib.get_data_path() function, you can delete the assert.

If you followed correctly, your code should look like this:

import matplotlib

mpl_data_dir = matplotlib.get_data_path()
datas = [ 
    (mpl_data_dir, "matplotlib/mpl-data"), 
]

#Link : https://stackoverflow.com/a/67922414