python读取一个txt文件 使其变成每行20个字符的形式？
如何让python把从txt文件中读入的文字按20个字符一行的形式分隔开呢。大概的思路是，先读入文件所有字符，然后使用range生成[0,20,40,...]的列表以供索引，然后用这个索引，生成有关于该字符串的新列表[s[0:20],s[20:40],...]，若不专门去除换行符，代码用这个思路就够了，可以这么写（以下13行就是）（限于python3）：
#-*-coding:utf-8;-*-
f=open("test.txt","w")
print("abcdefghijklmnopqrstabcd"
"efghijklmnopqrstopq",file=f)
f.close()
#生成待读入文件
#再从待读入文件中读入处理
f=open("test.txt","r")
s=f.read()
l=len(s)
b=(list(range(0,l,20)))
p=[s[i:i+20] for i in b]
r=[print(i) for i in p]
按每行20字符的形式输出样例txt
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