Added nested_mapping.py to map arbitrary nested data sets

nested_mapping.py

@@ -0,0 +1,89 @@
+from collections import Iterable
+
+
+def unique(seq):
+    """Return a new sequence made of unique elements from seq."""
+    uniques = []
+    [uniques.append(x) for x in seq if not uniques.count(x)]
+    return type(seq)(uniques)
+
+
+class StrType:
+    """Helper class to print and compare object types.
+         __eq__ implemented to allow for StrType enumaration
+         __hash__ implemented for compatibility with set objects
+         __repr__ and __str__ to print type(StrType.obj) as desired.
+    """
+    
+    def __init__(self, obj):
+        """Provide the object whose type you want to print."""
+        self.obj = obj
+
+    def __eq__(self, other):
+        if not isinstance(other, StrType):
+            return False
+        return type(self.obj) == type(other.obj)
+
+    def __hash__(self):
+        return hash(str(self))
+    
+    def __str__(self):
+        return f"<{type(self.obj).__name__}>"
+    
+    def __repr__(self):
+        return self.__str__()
+
+
+def get_structure(data):
+    """Return a kind of map of the could-be nested data.
+       Duplicates are removed from sequences.
+    """
+    if isinstance(data, dict):
+        return {key:get_structure(value) for key, value in data.items()}
+    elif (isinstance(data, Iterable)
+             and not isinstance(data, str)
+             and not isinstance(data, bytes)):
+        if data:
+            return unique(type(data)([get_structure(item) for item in data]))
+    return StrType(data)
+
+
+if __name__ == "__main__":        
+    from pprint import pprint
+    from datetime import datetime
+
+    class MaClasse:
+        pass
+    
+    nested = {'some types': {'MaClasse': MaClasse(),
+                             'datetime': datetime.now(),
+                             'empty-list': [],
+                             'empty-tuple': (),
+                             'float': 3.14,
+                             'int': 0,
+                             'list': [False,],
+                             'set': {'a',},
+                             'str': 'Babylone',
+                             'tuple': ('jah',)},
+              'sequence types': {'lists': ['a', 'b', 'c',
+                                           datetime.now(),
+                                           [1, 2, 3],
+                                           [1, 2, 3]],
+                                 'tuples': ('a', 'b', 'c',
+                                            datetime.now(),
+                                            [1, 2, 3],
+                                            [1, 2, 3]),
+                                 'sets': {'hello', 'world', 42, True}},
+              '2 same dict 1 other': [{'same':3, 'as':b'the other'},
+                                      {'same':3, 'as':b'the other'},
+                                      {'different':'from','the':'other'}],
+              'play me': MaClasse}
+    
+    structure = get_structure(nested)
+
+    print("The nested data:")
+    pprint(nested)
+    
+    print("")
+    print("Its mapping:")
+    pprint(structure)