PyQt 4 - global name 'SIGNAL' is not defined

Question

I am trying to connect a push button signal to a callable I created, but for some reason this error keeps on popping up. I've checked to make sure QtCore is imported ... what else am I missing?

Sample code:

from PyQt4 import QtCore
from PyQt4 import QtGui
import sys

class guiFindFiles(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        #Create window
        self.setFixedSize(400,180)
        self.setWindowTitle("Choose the files to use")

        #Create all layouts to be used by window
        self.windowLayout = QtGui.QVBoxLayout()
        self.fileLayout1 = QtGui.QHBoxLayout()
        self.fileLayout2 = QtGui.QHBoxLayout()
        self.fileLayout3 = QtGui.QHBoxLayout()

        #Create the prompt for user to load in the q script to use
        self.qFileTF = QtGui.QLineEdit("Choose the q script file to use")
        self.qFileButton = QtGui.QPushButton("Open")
        self.qFileButton.setFixedSize(100,27)
        self.fileLayout1.addWidget(self.qFileTF)
        self.fileLayout1.addWidget(self.qFileButton)

                    #Connect all the signals and slots
        self.connect(self.qFileButton, SIGNAL("pressed()"), self.loadFile)

        def loadFile():
            fileName = []

            selFile = QtGui.QFileDailog.getOpenFileName(self)
            print selFile

score 7 · Accepted Answer · edited Oct 08 '14 at 19:08

7

SIGNAL is inside QtCore, so the line should be:

self.connect(self.qFileButton, QtCore.SIGNAL("pressed()"), self.loadFile)

but you really should use the new style connections:

self.qFileButton.pressed.connect(self.loadFile)

And, unless you meant to differentiate a click from press/release couple, you'd better use clicked signal:

self.qFileButton.clicked.connect(self.loadFile)

edited Oct 08 '14 at 19:08

mmitchell

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answered Aug 24 '12 at 20:35

Avaris

35,883
7
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Thank you for your response. I tried the new style connections and it's working great! – Orchainu Aug 24 '12 at 20:53

score 1 · Answer 2 · answered Aug 24 '12 at 20:30

1

SIGNAL is defined inside QtCore, so you must use it within QtCore namespace if you've imported QtCore as a whole. So use:

QtCore.SIGNAL(...)

instead of:

SIGNAL(...)

Or you can import SIGNAL from QtCore explicitly:

from PyQt4.QtCore import SIGNAL

answered Aug 24 '12 at 20:30

Rostyslav Dzinko

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Thank you very much, this totally helped! – Orchainu Aug 24 '12 at 20:52
@Orchainu, if the answer helps - mark your question as answered so it could help another people facing same problem – Rostyslav Dzinko Aug 24 '12 at 20:54

PyQt 4 - global name 'SIGNAL' is not defined

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