function to combine dictionaries and list keys that are overwritten.

combine_dicts.py

a = {1: -1, 2: -2}
b = {2: 2, 3: -3}
c = {3: 3, 4: -4}
d = {3: 3j, 5: -5}


def combine_dicts(*args):
    """Combines multiple dictionaries in one. Overwrites the value of keys if they occur in multiple dicts.
    Value is taken from the """
    x = args
    overwritten_keys = []
    for i in range(1, len(x)):
        for key in x[i].keys():
            found_match = False
            for j in range(len(x) - 1, i - 1, -1):
                if key in x[j]:
                    overwritten_keys.append(key)
                    found_match = True
                    break
    if len(overwritten_keys) > 0:
        print('Following dict key-values will be overwritten by the last dict containing the key: {}'.format(overwritten_keys))
    return {k: v for i in x for k, v in i.items()}


z = combine_dicts(a, b, c, d)
print(z)