Json Pretty Printer

def get_pretty_obj(obj, tabs=0, tab='    '):
    pretty_obj = '{\n'

    keys = list(obj.keys())
    for i in range(0, len(obj)):
        key = keys[i]
        value = obj[key]

        pretty_obj += f'{(tabs + 1)*tab}{key}: {get_pretty(value, tabs+1)}'
        if i + 1 != len(obj):
            pretty_obj += ',\n'

    pretty_obj += f'\n{(tabs)*tab}' + '}'

    return pretty_obj

def get_pretty_array(array, tabs=0, tab='    '):
    pretty_array = '[\n'

    for i in range(0, len(array)):
        value = array[i]

        pretty_array += f'{(tabs + 1)*tab}{get_pretty(value, tabs+1)}'
        if i + 1 != len(array):
            pretty_array += ',\n'

    pretty_array += f'\n{(tabs)*tab}' + ']'

    return pretty_array

def get_pretty(input, tabs=0):
    input_type = type(input)
    if input_type is dict:
        return get_pretty_obj(input, tabs)
    elif input_type is list:
        return get_pretty_array(input, tabs)

    return input

if __name__ == "__main__":
    # main()
    obj = {'key': {'key': 'value'}, 'key2': 'value2', 'array': ['hey', {'hey': 'hey'}]}
    print(get_pretty(obj))