What are the steps to correctly set up PyGObject on macOS?

I am looking to run some basic examples and write code using GStreamer with its Python bindings. I need help installing the necessary packages to get started.

Check out this example:

import gi
gi.require_version('Gst', '1.0')
from gi.repository import Gst
Gst.init(None)
# ...
my_playbin = Gst.ElementFactory.make("playbin", None)
assert my_playbin
print my_playbin

I am currently having trouble getting PyGObject to work, as I cannot progress beyond the first line import gi.

I am using MacOS 10.12.6 and Python 3.6.5.

computer:Desktop me$ python3
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 05:52:31) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'gi'
>>>

Let's consult the official documentation.

This should guide us through installing PyGObject correctly, right?

I already have Homebrew installed, but I will reinstall it just to be safe.

computer:Desktop me$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

==> This script will install:
/usr/local/bin/brew

[Snip for brevity]

==> Installation successful!

==> Next steps:
- Run `brew help` to get started
- Further documentation: 
    https://docs.brew.sh

computer:Desktop me$

Now, let's proceed with installing pygobject3 and gtk+3.

computer:Desktop me$ brew install pygobject3 gtk+3
Updating Homebrew...
Warning: pygobject3 3.32.1 is already installed and up-to-date
To reinstall 3.32.1, run `brew reinstall pygobject3`
Warning: gtk+3 3.24.8 is already installed and up-to-date
To reinstall 3.24.8, run `brew reinstall gtk+3`
computer:Desktop me$

Let's test Python again:

computer:Desktop me$ python3
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 05:52:31) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import gi
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'gi'
>>>

Despite following the instructions, we still face the initial issue with no solution in sight.

We also tried different options such as --with-python3 and --without-python during the brew installation process.

computer:Desktop me$ brew install pygobject3 --with-python3 --without-python
    Updating Homebrew...

    [SNIP FOR BREVITY]

    Error: invalid option: --with-python3

All these options turned out to be invalid despite suggestions from online forums.

computer:Desktop me$ brew install pygobject3 --with-python@2 gtk+3
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/cask).
No changes to formulae.

[SNIP FOR BREVITY] 

Error: invalid option: --with-python@2

If anyone could provide insight into what might be missing, I would greatly appreciate it.

pythongstreamerpygobject

Answer №1

Apologies for the delay in providing this solution, but I have identified why the original method was not effective and have come up with a workaround for anyone encountering this issue in the future.

When using Homebrew to install pygobject3, it creates a symbolic link from a package installation directory, restricting access to pygobject3 solely from python binaries installed by Homebrew. However, by utilizing the python executable located at /usr/local/bin/python3, which corresponds to the install location of brew install python, you can successfully import pygobject3.

While this method works, it is not ideal and we may prefer to transfer pygobject3 to our preferred python installation.

I accomplished this task as follows:

$ cd /usr/local/Cellar/pygobject3/3.34.0/lib/python3.7/site-packages/
$ sudo cp -rf * /usr/local/anaconda3/lib/python3.7/site-packages/

Following this process, I am now able to import and utilize gi:

(base) 2l4@mac105220:/usr/local/anaconda3/lib/python3.7/ > python
Python 3.7.3 (default, Mar 27 2019, 16:54:48)
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from gi.repository import GLib
>>> loop = GLib.MainLoop()
>>> loop.run()

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