Replace multiple elements in string with str methods

Question

I am trying to write a function that takes a string of DNA and returns the compliment. I have been trying to solve this for a while now and looked through the Python documen

Answer 1

For a problem like this, you can use string.maketrans (str.maketrans in Python 3) combined with str.translate:

import string
table = string.maketrans('CGAT', 'GCTA')
print 'GCTTAA'.translate(table)
# outputs CGAATT