pyinstaller有时找不到Matplotlib后端TkAgg

Question

I'm using pyinstaller to package a windows executable for our PyQT tool.

pyinstaller.exe main.py --path path_to_pyqt_libs --distpath outputFolder --name toolName

4 out of 5 times, the tool can't find matplotlib backend TKagg:

19537 INFO:   Matplotlib backend "TkAgg": ignored
DLL load failed: The specified module could not be found.

The process still complete 'successfully' but I can't run the tool because of the missing library. Occasionally (~20% of the time), the library is found ('added') and everything works fine. The same behavior occurs on 2 different machines with similar environment.

What drives me crazy is that it sometimes works without any changes.

Any idea why this is happening and how I could solve this issue ?

Environment:

• Windows 7 sp1 64bit
• python 3.5.0
• pyQt 5
• pyinstaller 3.2.1
• matplotlib 2.0.2

UPDATE: The following minimal code is sufficient to reproduce the error:

#!/usr/bin/env python3

from PyQt5.uic import loadUiType

from matplotlib.backends.backend_qt5agg import (
    FigureCanvasQTAgg as FigureCanvas,
    NavigationToolbar2QT as NavigationToolbar)


if __name__ == '__main__':
    pass

Answer 1

If you got the same error doing this in a Python shell:

import matplotlib.backends._tkagg

Then you have to install the Visual C++ Redistributable Packages . I had the exact same problem and install that solve it.

Also I had to do this hidden-import for avoid tkinter errors:

--hidden-import='PIL._tkinter._finder

This answer was the solution