Suppress linebreak on file.write

问题

When writing to a text file, some of the file.write instances are followed by a linebreak in the output file and others aren't. I don't want linebreaks except where I tell them to occur. Code:

    for doc,wc in wordcounts.items(): 
        out.write(doc)             #this works fine, no linebreak
        for word in wordlist: 
            if word in wc: out.write("\t%d" % wc[word]) #linebreaks appear
            else: out.write("\t0")                      #after each of these
        out.write("\n")        #this line had mixed spaces/tabs

What am I missing?

Update

I should have taken a clue from how the code pasted into SO. For some reason there was a mixture of spaces and tabs in the final line, such that in TextMate it visually appeared outside the "for word..." loop—but the interpreter was treating it as part of that loop. Converting spaces to tabs solved the problem.

Thanks for your input.

回答1:

file.write() does not add any newlines if the string you write does not contain any \ns.

But you force a newline for each word in your word list using out.write("\n"), is that what you want?

    for doc,wc in wordcounts.items(): 
        out.write(doc)             #this works fine, no linebreak
        for word in wordlist: 
            if word in wc: out.write("\t%d" % wc[word]) #linebreaks appear
            else: out.write("\t0")                      #after each of these
            out.write("\n") #<--- NEWLINE ON EACH ITERATION!

Perhaps you indented out.write("\n") too far???

回答2:

You write a line breaks after every word:

for word in wordlist:
    ...
    out.write("\n")

Are these the line breaks you are seeing, or are there more additional ones?

回答3:

You might need to perform a strip() on each wc[word]. Printing a single item from wc is would probably be enough to determine if there are already line breaks on those items that area causing this behavior.

Either that or the indentation on your final out.write("\n") is not doing what you intended it to do.

回答4:

I think your indentation is wrong.

(also I took the liberty to make your if clause redundant and code more readable :)

for doc,wc in wordcounts.items()
   out.write(doc)
   for word in wordlist:
     out.write("\t%d" % wc.get(word,0))
   out.write("\n")

来源：https://stackoverflow.com/questions/1826400/suppress-linebreak-on-file-write