PyQT, pyqtgraph, and Cython

driver.py

from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg

## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
    import sys
    from window import CustomWindow


    app = QtGui.QApplication([])

    win = CustomWindow(title="Basic plotting examples")
    win.resize(1000,600)
    win.setWindowTitle('plot')

    # adding a PlotItem to a GraphicsWindow through a constructor, and addItem
    title = "Basic array plotting"
    p1 = pg.PlotItem(title=title)
    win.add(p1)

    # adding a data set through PlotDataItem constructor:
    d = pg.PlotDataItem(name='data set 1', y=np.random.normal(size=100))
    p1.addItem(d)

    p1.showAxis('bottom')

    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

setup.py

from setuptools import setup
from setuptools import Extension

from Cython.Build import cythonize

# execute:
# python setup.py build_ext --inplace
setup(
    ext_modules = cythonize("window.py")
)

window.py

# -*- coding: utf-8 -*-

from pyqtgraph.Qt import QtGui, QtCore
from PyQt4.QtCore import pyqtSlot
import pyqtgraph as pg

class Button(QtGui.QPushButton):
    def __init__(self, *args):
        super(self.__class__, self).__init__(*args)

        self.destroyed.connect(self.doSomeDestruction)
        self.clicked.connect(self.onClicked)

        # old style signal: old-style slots are always disconnected
        # self.connect(self, QtCore.SIGNAL("clicked()"), self.onClicked)

    @pyqtSlot()
    def onClicked(self):
        print 'clicked!'

    @pyqtSlot()
    def doSomeDestruction(self):
        print 'destroy button!'
        self.clicked.disconnect()
        self.destroyed.disconnect()

class CustomWindow(pg.GraphicsWindow):
    def __init__(self, *args, **kwargs):
        super(self.__class__, self).__init__(*args, **kwargs)

        # create a push button that says OK.
        self.btn = Button('OK')

        # add QPushButton to the GraphicsWindow:
        self.btn.setParent(self)
        self.btn.show()

    def add(self, plot):
        self.plot = plot
        self.addItem(plot)