python学习记录--默认字典defaultdict()

# -*- coding:utf-8 -*-
#常规方法需要指定字典值类型
dic = {'k1': []}
dic['k1'].append('alex')
#通过collections中的defaultdict()类，为字典值创建默认类型
import collections
dic = collections.defaultdict(list)#创建字典dic，值默认类型为列表
dic['k1'].append('alex')

all_list = [11, 22, 33, 44, 55, 66, 77, 88, 99]
dic1 = {}
for i in all_list:
    if i < 66:
        if 'k1' in dic1.keys():
            dic1['k1'].append(i)
        else:
            dic1['k1'] = [i]
    else:
        if 'k2'in dic1.keys():
            dic1['k2'].append(i)
        else:
            dic1['k2'] = [i]

print(dic1)

all_list = [11, 22, 33, 44, 55, 66, 77, 88, 99]
dic1 = collections.defaultdict(list)
for i in all_list:
    if i < 66:
        dic1['k1'].append(i)
    else:
        dic1['k2'].append(i)
print(dic1)