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POUnexpected file behavior python
 

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  1. POUnexpected file behavior python
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/13083183/weird-behavior-when-writing-and-reading-file">Weird behavior when writing and reading file</a> </p> </blockquote> <p>When I try to write into a file and then read it, I get an unexpected result.</p> <p>My code is:</p> <pre><code>f=open("z.txt","w+") f.write("Hello") content=f.read() print content f.close() </code></pre> <p>The outputted file is:</p> <blockquote> <p>Hellolף  ן (I11 (S'QUEUE' p1 (S'exec' p2 S'runcode' p3 (cidlelib.rpc unpickle_code p4 (S'c\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00@\x00\x00\x00s6\x00\x00\x00e\x00\x00d\x00\x00d\x01\x00\x83\x02\x00Z\x01\x00e\x01\x00j\x02\x00d\x02\x00\x83\x01\x00\x01e\x01\x00j\x03\x00\x83\x00\x00Z\x04\x00e\x01\x00j\x05\x00\x83\x00\x00\x01d\x03\x00S(\x04\x00\x00\x00s\x05\x00\x00\x00z.txts\x02\x00\x00\x00w+t\x05\x00\x00\x00HelloN(\x06\x00\x00\x00t\x04\x00\x00\x00opent\x01\x00\x00\x00ft\x05\x00\x00\x00writet\x04\x00\x00\x00readt\x07\x00\x00\x00contentt\x05\x00\x00\x00close(\x00\x00\x00\x00(\x00\x00\x00\x00(\x00\x00\x00\x00s\x17\x00\x00\x00C:/Users/x/Desktop/zt\x08\x00\x00\x00\x01\x00\x00\x00s\x06\x00\x00\x00\x0f\x01\r\x01\x0c\x01' tRp5 tp6 (dp7 ttp8 tp9 . ‘2ר ְ ז׀l Ak !<br> €qg ¸Ck PCk $ ְBkאBkנBk 8Ck<br> xCk XBkxBk °Ck׀CkנCkDk<br> @‘ (Ck˜Ck kצ Ck Ck<br> ְpg DkDֽ˜F ! €qg + ˜Ck<br> (Dk @k @k xDk ר?k @f HDkhDkpDk ˜Dk<br> נDkEk0EkPEk ְ” kצ<br> ְpg ! ˜F ,<br> ״Dk </p> <pre><code>@k @k ר?k </code></pre> </blockquote> <p>What am I doing wrong?</p>
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    1. COFirst of all, your `.read()` will have returned an empty string, since the write put the file position at the end. Secondly, the `w+` mode would have truncated the file, causing the file to be empty when you opened it. The extra data you see was added *after* this program was run. What else have you done with this file? Nothing in your code shown would have added the extra data, but the [`pickle` module](http://docs.python.org/2/library/pickle.html) output looks a lot like what you pasted here.
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      1. POUnexpected file behavior python
      1. USMartijn Pieters
 

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