Added a couple helpful debugging functions

manimlib/utils/debug.py

@@ -0,0 +1,21 @@
+from manimlib.constants import BLACK
+from manimlib.mobject.numbers import Integer
+from manimlib.mobject.types.vectorized_mobject import VGroup
+
+
+def print_family(mobject, n_tabs=0):
+    """For debugging purposes"""
+    print("\t" * n_tabs, mobject, id(mobject))
+    for submob in mobject.submobjects:
+        submob.print_family(n_tabs + 1)
+
+
+def get_submobject_index_labels(mobject, label_height=0.15):
+    labels = VGroup()
+    for n, submob in enumerate(mobject):
+        label = Integer(n)
+        label.set_height(label_height)
+        label.move_to(submob)
+        label.set_stroke(BLACK, 5, background=True)
+        labels.add(label)
+    return labels