remove useless file

snippets/python/flatten.py

@@ -1,9 +0,0 @@
-def flatten(d: dict, leaf_type=str):
-    out = {}
-    for key, value in d.items():
-        if isinstance(value, leaf_type):
-            out[key] = value
-        elif isinstance(value, dict):
-            out = {**out, **flatten(value)}
-        else:
-            raise ValueError("Unexpected value type: {type(value)}")