Update the code for imp's removal with python 3.12 (#865)

* Changed the `__init__.py` file to use importlib instead of imp.

i3pystatus/__init__.py

@@ -6,7 +6,8 @@ from i3pystatus.core.settings import SettingsBase
 from i3pystatus.core.util import formatp, get_module
 
 import argparse
-import imp
+import importlib.util
+import importlib.machinery
 import logging
 import os
 
@@ -35,6 +36,19 @@ def clock_example():
     status.run()
 
 
+def load_source(modname, filename):
+    """
+    From: https://docs.python.org/3/whatsnew/3.12.html?highlight=load_source#imp
+    """
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname, filename, loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
 def main():
     parser = argparse.ArgumentParser(description='''
         run i3pystatus configuration file. Starts i3pystatus clock example if no arguments were provided
@@ -44,6 +58,6 @@ def main():
 
     if args.config:
         module_name = "i3pystatus-config"
-        imp.load_source(module_name, args.config)
+        load_source(module_name, args.config)
     else:
         clock_example()