更新时间:2023-02-12 18:43:44
请注意,您的调用的结构是将 W
替换为 Y
在第一个调用,然后在第三次调用中再次将 Y
替换为 W
,撤消第一次调用的输出.
您应该使用 str.translate
,它比一堆链接的 replace
调用更高效和健壮:
_tab = str.maketrans(dict(zip('WXYZ', 'YZWX')))定义替换(字符串):返回 string.translate(_tab)
>>>替换('WXYZ')'YZWX'>>>替换(WWZYWXXWYYZW")'YYXWYZZYWWXY'
I am having some trouble figuring out how to replace multiple characters in a string.I am trying to write a functions called replace(string) that takes in an input, and replaces certain letters in the input with another letter.
Lets say I have the string "WXYZ" and I want to replace all the W with Y, X with Z, Y with W, and Z with X. I want it to do the replacement no matter what the input is. so if I also do something like replace("WWZXWWXYYZWYYY") it should replace the letters like I said above.
This is what I have done so far:
def replace(string):
for letters in string:
string = string.replace("W","Y").replace("X","Z").replace("Y","W").replace("Z","X")
print(string)
but when I run it with replace("WXYZ")
I get the output of the code as: WXWX
Instead of getting YZWX as the output. I also want to use the built in functions of python as well. Can someone help me figure this out, thank you!
Note that your calls are structured in such a way that W
is replaced with Y
in the first call, and then Y
is again replaced with W
in the third call, undoing the first call's output.
You should be using str.translate
, it's much more efficient and robust than a bunch of chained replace
calls:
_tab = str.maketrans(dict(zip('WXYZ', 'YZWX')))
def replace(string):
return string.translate(_tab)
>>> replace('WXYZ')
'YZWX'
>>> replace("WWZYWXXWYYZW")
'YYXWYZZYWWXY'