coding utf-8 data def flat data res for element in data if isinstance

# -*- coding: utf-8 -*-

data = [1,2,[3,4,[5,6]]]

def flat(data):
    res = []
    for element in data:
        if isinstance(element,list):
            res += flat(element)
        else:
            res.append(element)
    return res

print flat(data)