Return True if the bases represented by the str parameters form a base pair and False otherwise. Each str is a single character: one of 'A', 'T', 'C', and 'G'.
is_b_pair(letter,DNA):
new_letter =""
new_DNA += new_letter
if new_DNA in [GAATTC,AAGCTT]:
return True
else:
return False
please help