当不是所有的项目都在Python 3中定界时，如何在列表中分割定界字符串？

Question

I have a column of strings in a text file w/oa header (test_in.txt):

apple 
orange
banana
grape;pear;plum
cherry
pineapple

That I would like to have read:

apple
orange
banana
grape
pear
plum
cherry
pineapple

I'm using the following code:

with open("test_out.txt", "wt") as outfile:
with open("test_in.txt", "rt") as infile:
    for line in infile:
        line.split(";")
        outfile.write(line)

Can't seem to get it to work. I've tried "if" statements as well, but I'm definitely missing something.

Any help would be greatly appreciated!

Answer 1

line.split(";") returns the different words of your line, it does not modify line in place, so you need to write each returned word:

for word in line.split(";"):
    outfile.write(word)

Alternatively, you just replace all ; characters by \\n , for instance with:

outfile.write(infile.read().replace(';', '\n'))