循环时不追加所有项

Question

def PatternMatching(Pattern, Genome):
    positions = [] # output variable    
    for i in range(len(Genome)-len(Pattern)+1):    
        if Genome[i:i+len(Pattern)] == Pattern:
            print(i, Pattern)
            positions.append(Genome.index(Pattern))    
    return positions
# Now, set Text equal to the oriC of Vibrio cholerae and Pattern equal to "TGATCA"
Pattern = "TGATCA"
Genome="ATCAATGATCAACGTAAGCTTCTAAGCATGATCAAGGTGCTCACACAGTTTATCCACAACCTGAGTGGATGACATCAAGATAGGTCGTTGTATCTCCTTCCTCTCGTACTCTCATGACCACGGAAAGATGATCAAGAGAGGATGATTTCTTGGCCATATCGCAATGAATACTTGTGACTTGTGCTTCCAATTGACATCTTCAGCGCCATATTGCGCTGGCCAAGGTGACGGAGCGGGATTACGAAAGCATGATCATGGCTGTTGTTCTGTTTATCTTGTTTTGACTGAGACTTGTTAGGATAGACGGTTTTTCATCACTGACTAGCCAAAGCCTTACTCTGCCTGACATCGACCGTAAATTGATAATGAATTTACATGCTTCCGCGACGATTTACCTCTTGATCATCGATCCGATTGAAGATCTTCAATTGTTAATTCTCTTGCCTCGACTCATAGCCATGATGAGCTCTTGATCATGTTTCCTTAACCCTCTATTTTTTACGGAAGAATGATCAAGCTGCTGCTCTTGATCATCGTTTC"    

print(PatternMatching(Pattern, Genome))

此函数仅返回5、5、5、5、5、5、5、5、5，但正确的输出将为5,28,128,249,399,470,509,527

为什么所有后续匹配都会返回第一个匹配索引？

Answer 1

我在代码中发现了错误。第positions.append行(Genome.index(Pattern))应替换为positions.append(i)。这给出了正确的结果。