How to replace multiple characters with different input on same string python

Question

I am attempting to replace multiple letters within a string, I want the vowels to be replaced by the users input, and my current code replaces all the vowels with the same letters, however I want to replace the vowels with different user inputs. Below is an example of what I would like, and the code below that.

What I want

input1 = zz
input2 = xx
input3 = yolo

output = yzzlxx

What I have

input1 = zz
input2 = xx
input3 = yolo

output = yzzlzz

Here is my code.

def vwl():
    syl1 = input("Enter your first syllable: ")
    syl2 = input("Enter the second syllable: ")
    translate = input("Enter word to replace vowels in: ")

    for ch in ['a','e','i','o','u']:
        if ch in translate:
            translate=translate.replace(ch,syl1,)

    for ch in ['a','e','i','o','u']:
        if syl1 in translate:
            translate=translate.replace(ch,syl2,)

    print (translate)

Answer 1

The method replace takes an additional argument count:

translate=translate.replace(ch,syl1,1)
break # finish the for loop for syl1

will only replace the first instance of ch and break will ensure you don't replace any subsequent vowels with syl1.

Similarly:

translate=translate.replace(ch,syl2,1)
break # finish the for loop

Answer 2

You can use regular expressions:

translate = re.sub('a|e|i|o|u',input1,translate,count=1)
translate = re.sub('a|e|i|o|u',input2,translate,count=1)

Example:

>>> input1 = 'zz'
>>> input2 = 'xx'
>>> translate = 'yolo'
>>> import re
>>> translate = re.sub('a|e|i|o|u',input1,translate,count=1)
>>> translate
'yzzlo'
>>> translate = re.sub('a|e|i|o|u',input2,translate,count=1)
>>> translate
'yzzlxx'