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#!/usr/local/bin/python3

# return flat list from input list

import json

user_input = input('Enter a list with json format ...\n>')

try:

my_list = json.loads(user_input)

except json.decoder.JSONDecodeError:

print('invalid json input. unable to convert inout json to list !!!')

if not isinstance(my_list, list):

print('only list(array) are allowed !!!')

exit(1)

def flat(input_list):

result_list = []

for item in input_list:

if isinstance(item, list):

result_list.extend(flat(item))

else:

result_list.append(item)

return result_list

result = flat(my_list)

print('Input:', my_list)

print('Result:', result)