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POPython program not printing text file
 

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  1. POPython program not printing text file
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    <p>I'm working through the "Learn python the hard way" book, I've run into a problem in the <a href="http://learnpythonthehardway.org/book/ex16.html" rel="nofollow">Second Exercise of the 16th study drill.</a> I am using the newest version of python 3.</p> <p>The code I wrote looks like this so far:</p> <pre><code>from sys import argv script, filename = argv #we input the filename into argv print ("We're going to erase %r." % filename) #tells us the name of the file we're deleting print ("If you don't want that, hit CTRL-C (^C)") print ("If you do want that, hit RETURN.") input("?") #look into error unexpected EOF while parsing, I had to type "", if I don't program ends here print ("Opening the file...") target = open(filename, "w") #opens the file print ("Truncating the file. Goodbye!") target.truncate() #erases everything in the file print ("Now I'm going to ask you for three lines") line1 = input("line 1: ") line2 = input("line 2: ") line3 = input("line 3: ") #summary: we create 3 input variables we'll use under here print ("I'm going to write these to the file.") target.write(line1) #summary: we write in the terminal what we want in our file and use that target.write("\n") #we also have this newline command after every line to make sure it's not all in one line target.write(line2) target.write("\n") target.write(line3) target.write("\n") #The default code is done at this point print ("Type the filename again and I'll read it back to you or press CTRL + C (^C) to exit") file_again = input("&gt;") print (file_again) #Added to try to see what this gave me, it gives nothing back --- isn't working, why? print ("Now I'll read the file back to you!") #This prints text_again = open(file_again) #Not sure if this is working print (text_again.read()) #Is doing nothing in the Terminal print("And finally we close the file") #Works target.close() </code></pre> <p>At this point I'm wondering why the stuff after "#The default code is done at this point" is not working, I ripped it exactly as-is from another program (Exercise 15 of the same book), my Command line looks like this:</p> <pre><code>C:\PATH\Study Drills&gt;py SD8.py "test.txt" We're going to erase 'test.txt'. If you don't want that, hit CTRL-C (^C) If you do want that, hit RETURN. ?"" Opening the file... Truncating the file. Goodbye! Now I'm going to ask you for three lines line 1: "Hey" line 2: "yo" line 3: "sup" I'm going to write these to the file. Type the filename again and I'll read it back to you or press CTRL + C (^C) to exit &gt;"test.txt" Now I'll read the file back to you! </code></pre> <p>BONUS QUESTION: In the point where I say ("#look into error unexpected EOF while parsing, I had to type "", if I don't program ends here") why do I have to put quotation marks? If I don't the program ends with the error message mentioned in the comment. </p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
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    1. USErick
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. PO
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    1. COYou have to use quotes in an `input` becasue pyhton is expecting a string there. If there is no quotes it's going to look for a variable to print that is named `?` and you don't have one (nor could you).
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      1. POPython program not printing text file
      1. USkiley.a
 

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