split module loader in ModulesLoader and BackendsConfig classes

weboob/tools/misc.py

@@ -44,3 +44,42 @@ def local2utc(d):
     d = d.astimezone(tz.tzutc())
     return d
 
+def itersubclasses(cls, _seen=None):
+    """
+    itersubclasses(cls)
+
+    Generator over all subclasses of a given class, in depth first order.
+
+    >>> list(itersubclasses(int)) == [bool]
+    True
+    >>> class A(object): pass
+    >>> class B(A): pass
+    >>> class C(A): pass
+    >>> class D(B,C): pass
+    >>> class E(D): pass
+    >>>
+    >>> for cls in itersubclasses(A):
+    ...     print(cls.__name__)
+    B
+    D
+    E
+    C
+    >>> # get ALL (new-style) classes currently defined
+    >>> [cls.__name__ for cls in itersubclasses(object)] #doctest: +ELLIPSIS
+    ['type', ...'tuple', ...]
+    """
+
+    if not isinstance(cls, type):
+        raise TypeError('itersubclasses must be called with '
+                        'new-style classes, not %.100r' % cls)
+    if _seen is None: _seen = set()
+    try:
+        subs = cls.__subclasses__()
+    except TypeError: # fails only when cls is type
+        subs = cls.__subclasses__(cls)
+    for sub in subs:
+        if sub not in _seen:
+            _seen.add(sub)
+            yield sub
+            for sub in itersubclasses(sub, _seen):
+                yield sub