No module named 'charset_normalizer.md__mypyc'

I'm using PyInstaller to compile a program and keep coming across the error "No module named 'charset_normalizer.md__mypyc.'" The Charset-Normalizer package is installed.

As a test, I tried re-compiling a program that I had previously created in early September without issue, but now receive the same error. I thought that maybe there is an issue with the versions of either PyInstaller or Charset-Normalizer so I've experimented with different versions, but cannot get it to work.

7 Answers

You are probably missing the "chardet" library I installed it and it worked.

pip install chardet 

I had the EXACT problem. Scripts that I was able to make into executables using Pyinstaller before I could no longer do so again. In my script I used the pdfplumber package, which when you install it also installs other packages like pillow, wand, charset-normalizer, etc.

Since the error was regarding charset-normalizer for me as well, I tried different versions of it. For me it was version 2.1.0 that made the executable work again. Install it with the "pip install charset-normalizer==2.1.0" command: .

If it does not work, go to "Release history" on that link and try another version. Try to remember when was the last time you created a working executable and get the version you think will work for you.

This worked for me:

I just added

from charset_normalizer import md__mypyc 

to the top of my python script.

If you don't have the charset-normalizer library installed, then you should install it using the following command:

pip install charset-normalizer 

Pyinstaller may sometimes miss your dependency. In such a case run pyinstaller with the --collect-all option. In this case --collect-all charset_normalizer should force pyinstaller to include the dependency.

I have already installed chardet and charset-normalizer, but I still had the problem. Then I saw this Github issue. As suggested by IsraelAbebe, I solved the problem by

python -m pip install charset-normalizer==2.1.0 

This error is expected because of the way pyinstaller works.

To fix it, pass the pyinstaller CLI flag: --hidden-import charset_normalizer.md__mypyc

Or, if using SPEC file, set the hiddenimports param passed to Analysis:

 a = Analysis(['minimal.py'], pathex=['/Developer/PItests/minimal'], binaries=None, datas=None, hiddenimports=["charset_normalizer.md__mypyc"], hookspath=None, runtime_hooks=None, excludes=None, cipher=block_cipher) 

See for more context.

I got it to work by installing older versions of PyInstaller and Charest-Normalizer. Anytime this messages pops-up, consider installing an older version of the package.