备忘录

标签：cooper&fangtao

- jupyter notebook

- 扩展dict默认值

- 整体复习

my_dict = {‘name‘:‘coop‘,‘time‘:8.8}

my_dict

{‘name‘: ‘coop‘, ‘time‘: 8.8}

my_dict[‘beijing‘]

---------------------------------------------------------------------------

KeyError                                  Traceback (most recent call last)

<ipython-input-6-8c49445fad86> in <module>()
----> 1 my_dict[‘beijing‘]

KeyError: ‘beijing‘

my_dict.get(‘beijing‘,‘ ‘)  # 字典的默认输出之设置方法，避免报错

‘ ‘

my_dict.get(‘beijing‘)  # 如果没有设置空，则不打印任何东西

from  collections import defaultdict
todo =  defaultdict(lambda:‘nothing...‘)

type(todo)

collections.defaultdict

todo[‘222‘] = ‘buybuy‘

todo

defaultdict(<function __main__.<lambda>()>, {‘222‘: ‘buybuy‘})

todo[‘beijing‘]  # 该字典中没有该key，也不会报错，只会打印出默认的‘nothing

‘nothing...‘

#!/usr/bin/env Python
# -*- coding:utf-8 -*-
# 51memo.1.py
# A memo demo 51备忘录
# author: De8uG

__author__ = ‘De8uG‘

desc = ‘51备忘录‘.center(30, ‘-‘)
print(desc)
welcome = ‘welcome‘
print(f‘{welcome}‘, __author__)
print(‘请输入备忘信息：‘)

all_memo = []  

# TODO:这里要继续完成某个代码

is_add = True
all_time = 0    
while(is_add):
    in_date = input(‘日期：‘)
    in_thing = input(‘事件：‘)
    in_time = input(‘用时：‘)
    print(‘待办列表‘.center(30, ‘-‘))
    #one = ‘{date}, 处理{thing}, 用时{time}‘.format(date=in_date, thing=in_thing,time=in_time)

    one = {}
    one[‘date‘] = in_date  # in_date即上面的变量
    one[‘thing‘] = in_thing
    one[‘time‘]= in_time
    all_memo.append(one)

    all_time += int(in_time)

    num = 0
    for m in all_memo:
        num += 1
        print(‘%s:%s‘ %(num, m))
        print(f"{num}:{m}")
        print("{num1}:{m1}".format(num1=num,m1=m))

    print(f‘共{len(all_memo)}条待办事项, 总时长：{all_time}。‘, end=‘‘)
    print(‘（y：继续添加，n: 退出）‘)
    is_add = input().strip() == ‘y‘

------------51备忘录-------------
welcome De8uG
请输入备忘信息：
日期：2
事件：3
用时：4
-------------待办列表-------------
1:{‘date‘: ‘2‘, ‘thing‘: ‘3‘, ‘time‘: ‘4‘}
1:{‘date‘: ‘2‘, ‘thing‘: ‘3‘, ‘time‘: ‘4‘}
1:{‘date‘: ‘2‘, ‘thing‘: ‘3‘, ‘time‘: ‘4‘}
共1条待办事项, 总时长：4。（y：继续添加，n: 退出）
n

备忘录

标签：cooper&fangtao

原文地址：http://blog.51cto.com/13118411/2108345