Using a List of Lists as parameters for changing letters in a string

Question

I want to be able to take a string string = Cookie and replace specific letters with the parameters of a list of lists list = [[C,3], [i,1]]. I know you can use string.replace(C,3) for example to replace just the C but I want it to go through the specified list and change any corresponding letters. I've tried changing the list to a string and using a for loop to iterate over list in string , but it does not work. Any suggestions?

this is what I have so far:

myString = "Mississippi"
pairsList = [['i', '1'], ['s', '$'], ['p', 'z']]

pairslist = ''.join(pairsList)

for i in myString:
    if pairslist in myString:
        newString = myString.replace[pairslist]

Answer 1

You could use the translate method. For example,

mapping = str.maketrans({'C':'3','i':'1'})
print('Cookie'.translate(mapping))

The resulting output is 3ook1e.

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To match the example from the question:

myString = "Mississippi"
pairsList = [['i', '1'], ['s', '$'], ['p', 'z']]
mapping = str.maketrans(dict(pairsList))
print(myString.translate(mapping))

The result is M1$$1$$1zz1.

Answer 2

IF you really wanted to do this with loops, you'd loop over the replacements:

myString = "Mississippi"
pairsList = [['i', '1'], ['s', '$'], ['p', 'z']]
for old,new in pairsList:
    myString = myString.replace(old,new)

But the translate solution is really the correct one here.