如何在 python 中写入文件而不在特定位置添加新行？

Question

I want to write to a file without adding a new line at the iterations of a for loop except the last one.

Code:

items = ['1','2','3']
with open('file.txt', "w") as f:
        f.write('test' + '\n')
        for t in items:
         f.write(t + '\n')
        f.write('test' + '\n')
        for t in items:
         f.write(t + '\n')
        f.write('end')

Output in the file:

test
1
2
3
test
1
2
3
end

Output I want in the file:

test
123
test
123
end

Thanks.

Answer 1

items = ['1','2','3']
with open('file.txt', "w") as f:
        f.write('test' + '\n')
        for t in items:
         f.write(t)
        f.write('\n'+'test' + '\n')
        for t in items:
         f.write(t)
        f.write('\n'+'end')

Answer 2

This is code that should solve your issue

items = ['1', '2', '3']
with open('file.txt', 'w') as f:
    f.write('test \n')
    for i in items:
        f.write(i)
    f.write('\n')
    f.write('test \n')
    for i in items:
        f.write(i)
    f.write('\n')
    f.write('end')

Notice that you just want to iterate through the list items in the for loop, then add a separate write statement for the new line before the next 'test' Also it's best to just use the escape character \n for newline within the single quotes instead of attaching it with the '+' symbol.

Answer 3

if you want the list to become a string follow this template

num = ['1', '2', '3'] str1 = ""

for i in num: str1 += i

print(str1)

output: 123