You can do
from string import ascii_letters
spam = 'bcdfghjklmnpqrstuvwxyzBCDFGHJKLMNPQRSTUVWXYZ'
trans = str.maketrans({char:'!' for char in ascii_letters if char not in spam})
eggs = "aabbccddeeff"
foo = eggs.translate(trans)
print(foo)Docs on str.maketrans() and str.translate()
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs