Python 查找函数不起作用。我究竟做错了什么？

Question

我是一名业余程序员(我的实际专业是生物学)，所以如果代码很糟糕，我深表歉意。

无论如何，我正在做一个 rosalind.info 练习 ( http://rosalind.info/problems/subs/ )，它希望我找到较大 DNA 序列中包含特定 DNA 基序的每个索引。基本上，我需要找到字符串中子字符串的索引。应该很容易吧？好吧，也许你可以帮助我。

这是我的代码:

with open('rosalind_subs.txt') as f:
    seq = f.readline()
    seq.strip()
    subs = f.readline()
    subs.strip()
    break

def finder(x, y):
    index = x.find(y)
    return index

print("sequence is: " + seq)
print("subs is: " + subs)

print(finder(seq, subs))

这是我的输出:

sequence is:  ACCAGTCTCTTTTTTCTCTTTTCTCTTTTCTCTTTTGACCCTCTTTTCGTCACTCTTTTACCTCTTTTTCTCTTTTACTCTTTTCTCTTTTACTCTTTTACTCTTTTAGCGCAGATCTCTTTTCTCTTTTGGCTCTTTTGTCATCCTCTTTTAGACTCTTTTGGGAAGCGACGCCTCTTTTCTCTTTTCTCTTTTGCCTCTTTTTATAACCTAAAAGACTCTTTTCCCTCTTTTCCGATTTGCCAAGGGCTCTCTTTTCTCTTTTGCTCTTTTCTCTTTTCTCTTTTTACTCTTTTCTCTTTTCGCCCCAAGATTAACTCTTTTTCTCTTTTCTCTCTTTTTTCCTCTTTTCTCTTTTGAATTGACCTCTTTTTCTCTTTTTTTGGGCCGCTCTTTTCTCTTTTACTCTTTTCTCTCTTTTAACAGCTCTTTTCCTTCTCTTTTGTCTCTTTTAGTATACTCTTTTACTCTTTTCTCTTTTCTCTCTTTTACTCTTTTGCTCTTTTCTCTTTTTGTCTCTTTTGCCCTGTCTCTTTTCACGCTTCTCTTTTAGTGTACTCTTTTACTCTTTTTGGCTCTTTTCGAATTTGTTAGCTCTTTTGCTCTTTTCTCTTTTGCTCTTTTGTCTCTTTTGATCAGATTCTCTTTTTCTCTTTTCTCTTTTCCTTAAGCAGATTTCTCTTTTCTCTTTTTCTCTCTTTTGCTCTTTTACTCTTTTACTGCTTTCTCTTTTACAACCTCTTTTACTCTTTTAAGCTCTTTTCTCTTTTGCGCCTCTTTTCCTCCCCTCTTTTTAGCTCTTTTCTCTTTTTCGCTCTTTTCAGCTCTTTTCACTCTTTTGTTTTGAGCTCTTTTCAGACTCTTTTATCCTCTTTTTTCCTCTTTTAGCGCTCTTTTGTAGCCTCTTTT

motif is: CTCTTTTCT

-1

***Repl Closed***

我把***Repl Closed***留在那里，想尽一切办法。也许它与 Sublime REPL 有关？

无论如何，你可能无法仅通过观察来判断，但该基序实际上在 DNA 序列中多次被发现，只是查找功能没有识别到​​它。给出了什么？

Answer 1

break 不适用于 with 范围。请删除并尝试一下。我已经测试了下面的代码。

with open('rosalind_subs.txt') as f:
    seq = f.readline()
    seq.strip()
    subs = f.readline()
    subs.strip()

def finder(x, y):
    index = x.find(y)
    return index

print("sequence is: " + seq)
print("subs is: " + subs)

print(finder(seq, subs))

输出为

>>> 
sequence is: ACCAGTCTCTTTTTTCTCTTTTCTCTTTTCTCTTTTGACCCTCTTTTCGTCACTCTTTTACCTCTTTTTCTCTTTTACTCTTTTCTCTTTTACTCTTTTACTCTTTTAGCGCAGATCTCTTTTCTCTTTTGGCTCTTTTGTCATCCTCTTTTAGACTCTTTTGGGAAGCGACGCCTCTTTTCTCTTTTCTCTTTTGCCTCTTTTTATAACCTAAAAGACTCTTTTCCCTCTTTTCCGATTTGCCAAGGGCTCTCTTTTCTCTTTTGCTCTTTTCTCTTTTCTCTTTTTACTCTTTTCTCTTTTCGCCCCAAGATTAACTCTTTTTCTCTTTTCTCTCTTTTTTCCTCTTTTCTCTTTTGAATTGACCTCTTTTTCTCTTTTTTTGGGCCGCTCTTTTCTCTTTTACTCTTTTCTCTCTTTTAACAGCTCTTTTCCTTCTCTTTTGTCTCTTTTAGTATACTCTTTTACTCTTTTCTCTTTTCTCTCTTTTACTCTTTTGCTCTTTTCTCTTTTTGTCTCTTTTGCCCTGTCTCTTTTCACGCTTCTCTTTTAGTGTACTCTTTTACTCTTTTTGGCTCTTTTCGAATTTGTTAGCTCTTTTGCTCTTTTCTCTTTTGCTCTTTTGTCTCTTTTGATCAGATTCTCTTTTTCTCTTTTCTCTTTTCCTTAAGCAGATTTCTCTTTTCTCTTTTTCTCTCTTTTGCTCTTTTACTCTTTTACTGCTTTCTCTTTTACAACCTCTTTTACTCTTTTAAGCTCTTTTCTCTTTTGCGCCTCTTTTCCTCCCCTCTTTTTAGCTCTTTTCTCTTTTTCGCTCTTTTCAGCTCTTTTCACTCTTTTGTTTTGAGCTCTTTTCAGACTCTTTTATCCTCTTTTTTCCTCTTTTAGCGCTCTTTTGTAGCCTCTTTT

subs is: CTCTTTTCT
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