coding utf-8 data def flat data res if data if isinstance data list re

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

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

def flat(data):
    res = []
    if data != []
       if isinstance(data[0],list):
           res += flat(data[0])
       else:
           res.append(data[0])
       flat(data[1:])
    return res

print flat(data)