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.. SPDX-FileCopyrightText: 2014 Ole Martin Bjorndalen <ombdalen@gmail.com>
..
.. SPDX-License-Identifier: CC-BY-4.0
Freezing to EXE File
====================
PyInstaller
-----------
When you build an executable with PyInstaller and run it you may get
import errors like this one::
ImportError: No module named mido.backends.portmidi
The reason is that Mido uses ``import_module()`` to import the backend
modules, while PyInstaller looks for ``import`` statements.
The easiest fix is to import the module at the top of the program::
import mido
import mido.backends.portmidi # The backend you want to use.
print(mido.get_input_names())
and then run ``pyinstaller`` like usual::
$ pyinstaller --onefile midotest.py
$ ./dist/midotest
[u'Midi Through Port-0']
If you don't want to change the program, you can instead declare the
backend module as a `hidden import
<https://pyinstaller.org/en/stable/when-things-go-wrong.html#listing-hidden-imports>`_.
bbFreeze, py2exe, cx_Freeze, py2app, etc.
-----------------------------------------
I suspect the same is true for these, but I have not had a chance to
try it out yet.
Adding the explicit ``import`` statement should always work, though,
since Mido backends are just normal Python modules.
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