start work

music/application.py

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+import sys
+import gi
+gi.require_version('Gtk', '4.0')
+gi.require_version('Adw', '1')
+from gi.repository import Gtk, Adw
+
+
+class MainWindow(Gtk.ApplicationWindow):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        # Things will go here
+        self.box1 = Gtk.Box()
+        self.set_child(self.box1)
+
+        self.button = Gtk.Button(label="Hello")
+        self.box1.append(self.button)
+        self.button.connect('clicked', self.hello)
+
+        self.header = Gtk.HeaderBar()
+        self.set_titlebar(self.header)
+        self.open_button = Gtk.Button(label="Open")
+        self.header.pack_start(self.open_button)
+        self.open_button.set_icon_name("document-open-symbolic")
+
+    def hello(self, button):
+        print("Hello world")
+
+class MyApp(Adw.Application):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.connect('activate', self.on_activate)
+
+    def on_activate(self, app):
+        self.win = MainWindow(application=app)
+        self.win.present()
+
+app = MyApp(application_id="com.example.GtkApplication")
+app.run(sys.argv)

requirements.txt

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+PyGObject

shell.nix

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+let
+  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/b62d2a95c72fb068aecd374a7262b37ed92df82b.tar.gz") {};
+in pkgs.mkShell {
+  packages = [
+    (pkgs.python313.withPackages (python-pkgs: with python-pkgs; [
+      pygobject3
+    ]))
+  ];
+}