英文:
Swapping multiple instances of two characters in a string
问题
I'd like to find, if possible, a more succinct or elegant way to swap every occurrence of two specific characters in a string, but still readable and easy to understand, i.e. something akin to a, b = b, a for variables.
For example, say I want to swap the characters X and Y in the following string: "AAAXYAYXAXX" → "AAAYXAXYAYY".
The way I'm doing it currently is:
text = text.replace("B", "tempB").replace("A", "B").replace("tempB", "A")
but I'm wondering if there may be a better way.
英文:
I'd like to find, if possible, a more succinct or elegant way to swap every occurrence of two specific characters in a string, but still readable and easy to understand, i.e. something akin to a, b = b, a for variables.
For example, say I want to swap the characters X and Y in the following string : "AAAXYAYXAXX" → "AAAYXAXYAYY".
The way I'm doing it currently is
text = text.replace("B", "tempB").replace("A", "B").replace("tempB", "A")
but I'm wondering if there may be a better way.
答案1
得分: 1
你可以使用 translate 和 maketrans。
def swap_characters(text, char1, char2):
return text.translate(str.maketrans(char1 + char2, char2 + char1))
str.maketrans() 创建一个翻译表，将 char1 映射到 char2，反之亦然。然后，text.translate() 将翻译表应用于输入字符串。
英文:
You can use translate and maketrans.
def swap_characters(text, char1, char2):
return text.translate(str.maketrans(char1 + char2, char2 + char1))
str.maketrans() creates a translation table that maps char1 to char2 and vice versa. Then, text.translate() applies the translation table to the input string
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