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Invert dictionary python

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invert dictionary python 

inv_map = {v: k for k, v in my_map.items()}
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how to reverse a dictionary in python 

def inverse_dict(my_dict):
    """
    the func get a dictinary and reverse it, the keys become values and the values become keys.
    :param my_dict: the dictinary that need to be reversed.
    :return: a VERY pretty dictionary.
    """
    result_dict = {}
    for key, value in my_dict.items():
        if not value in result_dict.keys():
            result_dict[value] = []
        result_dict[value].append(key)
    return result_dict, print(result_dict)
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invert dictionary python 

orig = { 1:'A',  2:'B',  3:'C' }
new = dict(zip(orig.values(), orig.keys()))
new == {'A': 1, 'B': 2, 'C': 3} #True

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