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                所屬專題:[字符串算法](README.md) &emsp; ## 問題 **輸入:** 一條最長不超過1000 nt 的DNA序列`$ s $`. **輸出:** 四個整數(以空格分隔),分別計算四種核苷酸'A', 'C', 'G', 'T'在`$ s $`中出現的次數。 **樣例數據:** ``` AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC ``` **樣例輸出:** ``` 20 12 17 21 ``` &emsp; ## 背景知識 該問題涉及分子生物學的基礎入門知識。詳情請查閱ROSALIND網站上[關于該問題的背景說明](http://rosalind.info/problems/dna/)。 &emsp; ## 解答 ``` def dna_stat(s): """統計DNA序列中四種堿基的頻數""" num = [s.count('A'), s.count('C'), s.count('G'), s.count('T')] return num ## --main-- with open("rosalind_dna.txt", 'r') as f1: s = f1.read().strip() num = dna_stat(s) result = str(num[0]) + ' ' + str(num[1]) + ' ' + str(num[2]) + ' ' + str(num[3]) with open("rosalind_dna_out.txt", 'w') as f2: f2.write(result) ```
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