替换一个字符并在每行中添加“大于符号”

Question

Input:

Aa Ab,Ac,Ad
Ba Bb,Bc,Bd
Ca Cb,Cc,Cd

Expected output:

>Aa,Ab,Ac,Ad
>Ba,Bb,Bc,Bd
>Ca,Cb,Cc,Cd

Output:

>A
>a
>,
>A
>b
 :
>C
>d

Code:

with open(input, 'r') as fr, open(add_greater_than_sign, 'a') as fa:

    while True:
        line = fr.readline()
        line_replaced = line.replace('\t',',')
    
        appendText='>'
        for name in line_replaced:
            fa.write(appendText + name.rstrip() + '\n')
    
        if not line:
            break

I tried to replace a character and add 'greater than sign' in each line with this code. However, the result was like 'Output' file. Could you let me know what is wrong?

Answer 1

In your for name in line_replaced: you loop over each character of a line and write one line per character.

Keep it simple:

with open(input, 'r') as fr, open(add_greater_than_sign, 'a') as fa:
    for line in fr:
        fa.write('>'+line.replace('\t', ','))

NB. avoid using input as variable name, this is a python builtin