all: reformat python files with python black

Part of !537.

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/537

examples/python/gi/list-connections.py

@@ -5,14 +5,17 @@
 #
 
 import gi
-gi.require_version('NM', '1.0')
+
+gi.require_version("NM", "1.0")
 from gi.repository import NM
 
 # This example asks settings service for all configured connections.
 
+
 def print_values(setting, key, value, flags, data):
     print("  %s.%s: %s" % (setting.get_name(), key, value))
 
+
 if __name__ == "__main__":
     # create Client object
     client = NM.Client.new(None)
@@ -25,4 +28,3 @@ if __name__ == "__main__":
         print("=== %s : %s ===" % (c.get_id(), c.get_path()))
         c.for_each_setting_value(print_values, None)
         print("\n")
-