add parser.py

untested

settings/parser.py

+import configparser
+
+
+def convert(settings, opt, value):
+    t = type(getattr(settings, opt))
+    try:
+        return t(value)
+    except:
+        return None
+
+
+def parse(path, settings):
+    config = configparser.ConfigParser()
+    config.read(path)
+
+    root = 'settings'
+    root = config[root]
+
+    for opt, value in settings.get_options():
+        if opt in root:
+            v = convert(settings, opt, root[opt])
+            if v is not None and settings.check_constr(opt, v):
+                setattr(settings, opt, v)