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POpython readline() returns multiple lines
 

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  1. POpython readline() returns multiple lines
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    <p>I think I have created a problem for myself....</p> <p>I have two functions and a global file descriptor(file object)</p> <pre><code>def fileController(): global fd fName = ui.fileEdit.text() if ui.lineByLine.isChecked: ui.fileControl.setText('Next Line') ui.fileControl.clicked.connect(nextLine) fd = open(fName, 'r') def nextLine(): global fd lineText = fd.readline() print lineText def main(): app = QtGui.QApplication(sys.argv) global ui ui = uiClass() ui.fileControl.clicked.connect(fileController) ui.lineByLine.stateChanged.connect(lineByLineChange) sys.exit(app.exec_()) if __name__ == '__main__': main() </code></pre> <p>when nextLine() is called, it returns the first line.<br> if it is called again it returns the first line and the second line.<br> if it is called yet again it returns the first line and the second line and the third line. etc. etc.</p> <p>could the file descriptor being a global variable cause this?</p> <p>complete un-redacted code can be found <a href="https://github.com/MrRadiotron/crossTerm/blob/master/crossTerm.py" rel="nofollow">here</a></p> <p>all help is appreciated!</p> <p>EDIT: included more of the code for context<br> EDIT2: added link to github project file</p> <p>SOLVED: problem was that:</p> <pre><code>ui.fileControl.clicked.connect(nextLine) </code></pre> <p>does not disconnect the previous signal. so every time file Control() was clicked a "signal and slot" was added so that newLine() was called multiple times. And as fileController was still being called the file was being reopened. So I saw the behaviour above. Thanks for all the advice!</p>
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    1. USMrRadiotron
    1. USMrRadiotron
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    1. COPost an example interpreter session. (A real one; run the code in the interactive interpreter and copy/paste a transcript.)
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      1. POpython readline() returns multiple lines
      1. USuser2357112
    2. COYour function doesn't return *anything*.
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      1. POpython readline() returns multiple lines
      1. USIgnacio Vazquez-Abrams
    3. COTry a generator: [Lazy Method for Reading Big File in Python?](http://stackoverflow.com/questions/519633/lazy-method-for-reading-big-file-in-python)?
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      1. POpython readline() returns multiple lines
      1. USMr. Polywhirl
 

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