9.1代码

genome_text = 'TTATGTTTTAAGGATGGGGCGTTAGTT'


def div_word(word_to_judge):
    len_num = len(word_to_judge)
    save_word = ""
    if len_num % 3 == 0:
        print("This word is valid")
        if save_word.find("ATG") == "ATG":
            for i in range(1,len_num):
                save_word = word_to_judge[0 + i:i + 3]
            print(save_word)


    else:
        print("This word is invalid")


div_word(genome_text)

代码结果
我没用find这个命令.我想用for循环不断循环一个个遍历这些字符.
有的时候有结果,有的时候只能沉淀

.9.2
今天研究了一个对文本进行分割的函数

def div_text(start_num, end_num, text_word):
    text_i_save = ""
    for i_t in range(start_num, end_num):
        text_i_save += text_word[i_t]
    print(text_i_save)



div_text(0, 3, genome_text)
div_text(4, 7, genome_text)
div_text(8,11, genome_text)

# 这个序列不对.应该遵循的是另一个模式
div_text(0, 3, genome_text)
div_text(4, 7, genome_text)
div_text(8,11, genome_text)

div_text(0, 3, genome_text)
div_text(2, 5, genome_text)
div_text(4, 7, genome_text)
div_text(6, 9, genome_text)
div_text(8, 11, genome_text)
div_text(10, 13, genome_text)

起始到结束间隔3, 两行之前的起始和截止都间隔2.这样的就可以遍历整个字符串

大家看当起始从-2+i的时候结果

for i in range(0, len_num, 2):
    div_text(-2 + i, 1 + i, genome_text)

多出了TTT
那我就删除呗,好见证奇怪的时候来了

for i in range(0, len_num, 2):
    div_text(0 + i, 1 + i, genome_text)

我们来进行打印分析

for i in range(0, len_num, 2):
    div_text(0 + i, 1 + i, genome_text)
    print("0+i", 0 + i, "1+i", 1 + i)

又换成了-2

我发现我画蛇添足了.起始位置,直接用i就完事了,成功了.
但是新的问题开始

在函数div_text里

 text_i_save += text_word[i_t]

它没事呀.怎么一放到循环里变成了这个怪样子.???

for i in range(0, len_num, 2):
    if i+2 < len_num:
        div_text(i, i + 3, genome_text)

def cut_word_start(judge_word,text_word):
    len_num = len(text_word)
    for i in range(0, len_num, 2):
        if i + 2 < len_num:
            if div_text(i, i + 3, text_word) == judge_word:
                print(text_word[i + 3:])

genome_text = 'TTATGTTTTAAGGATGGGGCGTTAGTT'
len_num_out = len(genome_text)


def div_text(start_num, end_num, text_word):
    text_i_save = ""
    for i_t in range(start_num, end_num):
        text_i_save += text_word[i_t]
    return text_i_save


def cut_word_start(judge_word, text_word):
    len_num = len(text_word)
    for i in range(0, len_num, 2):
        if i + 2 < len_num:
            if div_text(i, i + 3, text_word) == judge_word:
                return text_word[i + 3:]


def cut_word_end(judge_word, text_word):
    len_num = len(text_word)
    for i in range(0, len_num, 2):
        if i + 2 < len_num:
            if div_text(i, i + 3, text_word) == judge_word:
                print(text_word[:i+3])
                # print(i)
            else:
                print('a',i)

def main():
    a = cut_word_start("ATG", genome_text)
    # print(a)
    cut_word_end("TAA", a)

main()