草稿一、用单一方法遍历文本

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

草稿二、尝试分割文本

.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)  

一、利用分割文本得到的结果这里写目录标题

 # 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)   

二、遍历了整个字符串的序列

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

三、奇怪的循环遍历了整个字符串的序列

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

四、新的问题string index out of range

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.???

五、字符串索引超出范围这里写目录标题

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

五、区分开头ATG的函数里写目录标题

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:]) 

六、9.2 17点前写的代码段,可以截取ATG开头这里写目录标题

 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()