python - 在列表之间添加逗号和和

如何在每个列表元素之间添加逗号，并在最后2个元素之间添加“和”，因此输出为：

My cats are: Bella
My cats are: Bella and Tigger
My cats are: Bella, Tigger and Chloe
My cats are: Bella, Tigger, Chloe and Shadow

这是我拥有的两个功能，但两个都无法正常工作：

Example = ['Bella', 'Tigger', 'Chloe', 'Shadow']

def comma_and(list):
    for i in range(len(list)):
        print('My Cats are:',', '.join(list[:i]), 'and', list[-1],)


def commaAnd(list):
    for i in range(len(list)):
        print('My Cats are:',', '.join(list[:i]), list.insert(-1, 'and'))

我当前的输出是：

>> comma_and(Example)
My Cats are:  and Shadow
My Cats are: Bella and Shadow
My Cats are: Bella, Tigger and Shadow
My Cats are: Bella, Tigger, Chloe and Shadow

>> commaAnd(Example)
My Cats are:  None
My Cats are: Bella None
My Cats are: Bella, Tigger None
My Cats are: Bella, Tigger, Chloe None

最佳答案

第一个解决方案几乎已经是您想要的。您只需确保不总是从列表（-1）中获取最后一个元素，而是从当前迭代中获取最后一个元素：

>>> for i in range(len(list)):
        print('My Cats are:',', '.join(list[:i]), 'and', list[i])

My Cats are:  and Bella
My Cats are: Bella and Tigger
My Cats are: Bella, Tigger and Chloe
My Cats are: Bella, Tigger, Chloe and Shadow

然后，只需在只有一个项目时对第一个迭代进行特殊处理：

>>> for i in range(len(list)):
        if i == 0:
            cats = list[0]
        else:
            cats = ', '.join(list[:i]) + ' and ' + list[i]
        print('My Cats are:', cats)


My Cats are: Bella
My Cats are: Bella and Tigger
My Cats are: Bella, Tigger and Chloe
My Cats are: Bella, Tigger, Chloe and Shadow

关于python - 在列表之间添加逗号和和，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49590863/