How can I combine dictionaries with the same keys?

Question

I have a list of dictionaries like so:

dicts = [
    {\'key_a\': valuex1,
     \'key_b\': valuex2,
     \'key_c\': valuex3},

    {\'key_a\': valuey1,
     \         


        

Answer 1

You can merge dictionaries in the following way:

def merge_dicts(dict_list, separator=''):
    """
    Merges list of dictionaries to a single dictionary, Concatenates values with the same key.
    :param dict_list: list of dictionaries to be merged.
    :param separator: separator to be inserted between values of same key.
    :return: Merged dictionary.
    """
    return {k1: separator.join([d[k1] for d in dict_list if k1 in d])
            for k1 in set(reduce(lambda x, y: x+y, [k.keys() for k in dict_list]))
    }