Code
print(dict_structure({
"key_1": "A string",
"longerkey_2": [1,2,3],
"key_3": dict(a=[], b="2", c=3)
}))
key_1 : <class 'str'>
longerkey_2 : <class 'list'>
key_3 : <class 'dict'>
a : <class 'list'>
b : <class 'str'>
c : <class 'int'>