Python 把字典中多个列表合并为一个列表

字典中值许多列表，通过itertools这个库快速合并成为一个列表

import itertools

data_dict = {
    'xiaoming':['1','2'],
    'xiaomei':['3','4']
}

data_list = list(data_dict.values)
merge = itertools.chain.from_iterable(order_id_list)
result = list(merge)
print(result)

# 
['1','2','3','4']