CODE CHALLENGE: Solve the Reverse Complement Problem.

Sample Input:

     AAAACCCGGT

Sample Output:
     ACCGGGTTTT

##надобно: для цепочки ДНК сгенерить комплементарную в обратном направлении (реверснутую)

def  reverse_complement(pattern):
    reverse_pattern = []
    for i in range(len(pattern)):
        if pattern[i] == "A":
           reverse_pattern.insert(i,"T")
           
        elif pattern[i] == "T":
           reverse_pattern.insert(i,"A")
           
        elif pattern[i] == "C":
           reverse_pattern.insert(i,"G")
           
        elif pattern[i] == "G":
           reverse_pattern.insert(i,"C")
           
        else:
           print "error. not DNA nucleotide"
    
    reverse_pattern.reverse()
    return "".join(reverse_pattern)
print reverse_complement("AAAACCCGGT")

ай дидит=) коррект!