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POTotal Python Noob: why doesn't this work?
 

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  1. POTotal Python Noob: why doesn't this work?
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    <p>I'm working through Learn Python the Hard Way, and trying to <em>understand</em> it rather than just hammer away. I got stuck on Exercise 16, as discussed already on SO here: </p> <p><a href="https://stackoverflow.com/questions/6394170/very-basic-python-question-strings-formats-and-escapes">Very basic Python question (strings, formats and escapes)</a></p> <p>but I'm still trying to figure out why this approach does not work: </p> <pre><code>from sys import argv script, filename = argv print "Attempting to open the file now." print open(filename).read() print "We're going to erase %r." % filename print "If you don't want that, hit CTRL-C." print "If you do want that, hit RETURN." raw_input("?") print "Opening the file..." target = open(filename, 'w') print "Truncating the file. Goodbye!" target.truncate() print "Now I'm going to ask you for three lines." line1 = raw_input("line 1: ") line2 = raw_input("line 2: ") line3 = raw_input("line 3: ") print "I'm going to write these to the file." linebreak = "\n" target.write("%s %s %s %s %s %s") % (line1, linebreak, line2, linebreak, line3, linebreak) target.write("the ending line") print "And finally, we close it." target.close() </code></pre> <p>I've established a value for linebreak, and am calling the line1, line2 and linebreak values with %s in the target.write command. Should't it parse as "line1 \n line2 \n line3 \n" when it's read? </p> <p>This is probably the equivalent of being asked by a child what keeps the sky up or something, and I apologize for being kind of thick. Thanks! </p>
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    1. USJeanSibelius
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    1. COCan you elaborate on "doesn't work"? Do you get an exception? If so, please provide it. If not, please explain what you're expecting and what you're actually receiving.
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    2. COIn what way does this fail?
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      1. POTotal Python Noob: why doesn't this work?
      1. USDavid Heffernan
    3. COAnd on the off chance I can guess at it - is it possible that when you re-open the file to verify its contents that the editor you're using doesn't recognize `\n` as a newline and that it is in fact looking for `\r\n` (carriage return + line feed)? This is common in Notepad on Windows, for example.
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