python - 从字典中的列表中删除方括号和逗号

Question

我是一名新手程序员，我不知道如何从我从带列表的字典中提取的值中删除括号和逗号。我错过了什么？

据我所知，for 循环通常会删除它们，但现在不会这样做。

简化代码:

dict = { 
    'name1': ['python', 'c', 'java'],
    'name2': ['c.'],
    'name3': ['ruby', 'go'],
    'name4': ['javascript', 'python'],
    'name5': [],
    }

for k, v in dict.items():
    if len(v) ==  1:        
        print(str(k).title() + "'s favorite language is " + str(v).title() + "\n")
    elif len(v) > 1:
        print(str(k).title() + "'s favorite languages are: \n" + str(v).title() + "\n")
    elif len(v) < 1 :
        print(str(k).title() + " does not have a favorite language")

Answer 1

使用join和 map :

dict = {
    'name1': ['python', 'c', 'java'],
    'name2': ['c.'],
    'name3': ['ruby', 'go'],
    'name4': ['javascript', 'python'],
    'name5': [],
    }

for k, v in dict.items():
    if len(v) == 1:
        print(str(k).title() + "'s favorite language is " + ', '.join(map(str.title, v)) + "\n")
    elif len(v) > 1:
        print(str(k).title() + "'s favorite languages are: \n" + ', '.join(map(str.title, v)) + "\n")
    elif len(v) < 1 :
        print(str(k).title() + " does not have a favorite language")

输出

Name3's favorite languages are: 
Ruby, Go

Name5 does not have a favorite language
Name2's favorite language is C.

Name4's favorite languages are: 
Javascript, Python

Name1's favorite languages are: 
Python, C, Java

想法是将 str.title 应用于值列表中的每个字符串(使用 map)，然后通过逗号和空格连接这些字符串 (', ' ).请注意，您可以更改连接的字符串以满足您的需要。