Akira_Z

 

Python习题(5)

Given: an array containing hashes of names

Return: a string formatted as a list of names separated by commas except for the last two names, which should be separated by an ampersand.

Example:

 1 namelist([ {'name': 'Bart'}, {'name': 'Lisa'}, {'name': 'Maggie'} ])
 2 # returns 'Bart, Lisa & Maggie'
 3 
 4 namelist([ {'name': 'Bart'}, {'name': 'Lisa'} ])
 5 # returns 'Bart & Lisa'
 6 
 7 namelist([ {'name': 'Bart'} ])
 8 # returns 'Bart'
 9 
10 namelist([])
11 # returns ''

 

Solution:

首先分析Given data,namelist是个列表与字典混合的类型,如果读取Bart,用namelist[0]['name']的写法。

判断names是否为[],如果为空则直接返回;如果不为空,再用join和format的方法进行字符串拼接。

1 def namelist(names):
2     if names:
3         return '{} & {}'.format(', '.join(name['name'] for name in names[:-1]), names[-1]['name'])
4     else:
5         return ""

 

posted on 2020-07-08 17:30  Akira_Z  阅读(154)  评论(0编辑  收藏  举报

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