Python: Comma Code

最新推荐文章于 2024-12-17 14:17:09 发布

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最新推荐文章于 2024-12-17 14:17:09 发布

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分类专栏： Python实践项目文章标签： Python list

本文链接：https://blog.youkuaiyun.com/weixin_41569319/article/details/81006702

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本文介绍了一种将列表转换为带有特定格式的字符串的方法。通过定义函数list2Str，可以将列表项用逗号隔开，并在最后一项前插入'and'。提供了两种实现方式：一种是通过循环逐个拼接字符串；另一种则是利用Python内置函数join来简化代码。

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学习《Python编程快速上手》P79

问题链接：https://automatetheboringstuff.com/chapter4/

Say you have a list value like this:

spam = ['apples', 'bananas', 'tofu', 'cats']

Write a function that takes a list value as an argument and returns a string with all the items separated by a comma and a space, with and inserted before the last item. For example, passing the previous spam list to the function would return 'apples, bananas, tofu, and cats'. But your function should be able to work with any list value passed to it.

代码实现（1）：

#  Problem: Comma Code
#  The url of the problem: https://automatetheboringstuff.com/chapter4/

# Define the function
def list2Str(List):
    Str = ''
    
    for i in range(len(List)-1):
        Str += List[i] + ', '
        
    Str += ('and ' + List[-1])
    
    return Str
    
# Enter a list    
spam = ['apples','bananas','tofu','cats']

# Show the result
print(list2Str(spam))

代码实现（2）：

#  Problem: Comma Code
#  The url of the problem: https://automatetheboringstuff.com/chapter4/

# Define the function
def list2Str(List):
    List[-1] = 'and ' + List[-1]
    return ', '.join(List)

# Enter a list    
spam = ['apples','bananas','tofu','cats']

# Show the result
print(list2Str(spam))