PyInstaller failing to include some modules from C:\Python27\Lib

Question

I\'ve been repeatedly making good PyInstaller executables of a Tkinter utility program, and suddenly this morning the resulting executable fails with a \"can\'t import\" error f

Answer 1

Found a fix, if not the cause. Here's my updated build line:

pyinstaller --hidden-import=timeit --hidden-import=bisect -F MyMainModule.py

Still not sure why PyInstaller suddenly forgot how to find these two modules (and only these two modules) among over 20 other modules correctly included in the build.