[Solved] TypeError “int” in Python

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You can rewrite the function like below: 

def concatenate_list_data(list):
    result=""
    for element in list:
        result += str(element)
    return result

my_result = concatenate_list_data([1, 5, 12, 2])   # leads to 15122

Another approach to the same can be using a list comprehension: 

to_join = [1, 5, 12, 2]
output="".join([str(i) for i in to_join])

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solved TypeError “int” in Python