python操作dict/list等记录

 

 

from collections import defaultdict

...

# 创建一个dict，声明它的val格式为list。如{key:[1,2,3],key2:[]...}
dict_temp = defaultdict(list)

 

 

import numpy as np


# 创建一个二维数组，参数类型为double
matrix = np.zeros((colnum,rownum),dtype = np.double)