在字符串列表中搜索关键字并替换整个字符串（如果它包含该关键字）

Question

我有一个字符串列表mylist，我想搜索每个字符串，看看它是否有某个关键字，假设关键字是"blue"。如果我在任何特定字符串中找到单词 blue，我想将该 整个 字符串更改为完全不同的字符串。到目前为止，我已经找到了一种方法来更改该特定字符串，然后在我的“for”循环中成功打印它，但是当我打印完整列表时，它不再被更改。这就是我的意思：

输入：

mylist = ['my name is bob','my favorite color is blue', 'eggs are tasty']

for i in mylist:
    if 'blue' in i:
        i = i.replace(str(i),'Found blue')
        print(i)
print(mylist)

输出：

Found blue

['my name is bob','my favorite color is blue', 'eggs are tasty']

如您所见，print(i) 替换了我想要的字符串，但是当我打印完整列表时实际列表没有改变

有没有办法以这种方式更改列表，还是我需要以不同的方式处理？

Answer 1

您需要将其实际分配回列表because strings are immutable in Python：

mylist = ['my name is bob','my favorite color is blue', 'eggs are tasty']

for i in range(len(mylist)):
    if "blue" in mylist[i]:
        mylist[i] = "Found blue" # no need to use replace if you're going to change the whole string

或者，您可以使用列表推导式或地图

mylist = ['my name is bob','my favorite color is blue', 'eggs are tasty']
mylist[:] = ["Found blue" if "blue" in i else i for i in mylist]

# Or
mylist = ['my name is bob','my favorite color is blue', 'eggs are tasty']
mylist[:] = list(map(lambda i: "Found blue" if "blue" in i else i, mylist))