使用python为txt的每一行添加前缀和后缀

Question

I need to add some texts to a document like this:

Original document:

C:\listagem.txt

i love python  
macdonals hamburger  
yolo 4ever  

I need to add a suffix and a prefix, so the result would look like this:

teste.txt

blablablai love pythongugugugugu  
blablablamacdonalds hamburgergugugugugu  
blablablayolo 4evergugugugugu  

I already tried this algorithm, but it didn't work.

prefix = 'blablabla'  
suffix = 'gugugugugu'  
dest = ''  
with open('C:\listagem.txt', 'r') as src:  
    with open('teste.txt', 'w') as dest:  
        for line in src:  
            dest.write('%s%s%s\n' % (prefix, line.rstrip('\n'), suffix))

I am using python 3.2.3 on windows XP.

Answer 1

Your code is mostly file, but the filename is the problem. See this answer on Stackoverflow .

Change your path like so:

with open('C:\\listagem.txt', 'r') as src:

..or using raw strings :

with open(r'C:\listagem.txt', 'r') as src:  # r'raw string' ignores backslashes

..or you can maybe just use forward slashes - if this works, I'd recommend it (as backslashes are a pain):

with open('C:/listagem.txt', 'r') as src:

Also note that your sample input file appears to contain trailing whitespace. In your supplied data, there is two spaces after the i love python , thus your output looks like so:

{prefix}i love python  {suffix}

This might have been introduced in your Stackoverflow question, rather than the original file.