检查列表中哪个元素有我正在搜索的字符串

Question

我有一个列表，我想检查字符串“Monday”是否在其中，但我想知道，如果是，那么它在列表的哪个元素中

    list1 = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]
if "Monday" in list1:
    print("True")

Answer 1

list1 = ["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]
if "Monday" in list1:
    print(list1.index("Monday"))

Answer 2

您可以尝试使用enumerate()函数：

for i, j in enumerate(["Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"]):
    if j == 'Monday':
        print i

这将为您提供变量“Monday”的索引位置，在本例中，该项位于列表中的任何位置—考虑到它可能在多个位置列出

Answer 3

如果我们正在搜索“b”：

[x for x,y in enumerate(["a","b","b","c","d","e","f","g"]) if "b" in y]

将说明多个外观，并将所有外观的索引作为一个列表提供

以上返回为：[1, 2]