def reverse_complement(pattern): ''' Input: A DNA string Pattern. Output: Pattern, the reverse complement of Pattern. ''' complementary = {"A": "T", "C": "G", "G": "C", "T": "A" } reverse_complement = "" for index in range(len(pattern)): reverse_complement = complementary[pattern[index]] + reverse_complement return reverse_complement def pattern_matching(pattern, genome): ''' Input: Two strings, Pattern and Genome. Output: A collection of space-separated integers specifying all starting positions where Pattern appears as a substring of Genome ''' starting_positions = "" position = 0 while True: position = genome.find(pattern, position) if not position == -1: starting_positions = starting_positions + " " + str(position) position += 1 else: break return starting_positions.strip()
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