Dictionaries and pyqt

Question

I am working on a GUI with pyqt and pyqtgraph. In my application, I have 10 tabbed imageview, I was wondering how I could convert the following which takes too many lines with a more elegant pythonic way to address these objects. So instead of something like this:

img1 = pg.ImageView() 
img2 = pg.ImageView() 
img3 = pg.ImageView()
img4 = pg.ImageView()
img5 = pg.ImageView()
img6 = pg.ImageView()
img7 = pg.ImageView()
img8 = pg.ImageView()
img9 = pg.ImageView()
img10 = pg.ImageView()


tab_widget = QtGui.QTabWidget() 
tab1 = QtGui.QWidget() 
tab2 = QtGui.QWidget() 
tab3 = QtGui.QWidget() 
tab4 = QtGui.QWidget() 
tab5 = QtGui.QWidget() 
tab6 = QtGui.QWidget() 
tab7 = QtGui.QWidget() 
tab8 = QtGui.QWidget() 
tab9 = QtGui.QWidget() 
tab10 = QtGui.QWidget() 

p1_vertical = QtGui.QVBoxLayout(tab1) 
p2_vertical = QtGui.QVBoxLayout(tab2) 
p3_vertical = QtGui.QVBoxLayout(tab3) 
p4_vertical = QtGui.QVBoxLayout(tab4) 
p5_vertical = QtGui.QVBoxLayout(tab5) 
p6_vertical = QtGui.QVBoxLayout(tab6) 
p7_vertical = QtGui.QVBoxLayout(tab7) 
p8_vertical = QtGui.QVBoxLayout(tab8) 
p9_vertical = QtGui.QVBoxLayout(tab9) 
p10_vertical = QtGui.QVBoxLayout(tab10) 

tab_widget.addTab(tab1, "Grid 1") 
tab_widget.addTab(tab2, "Grid 2")
tab_widget.addTab(tab3, "Grid 3") 
tab_widget.addTab(tab4, "Grid 4") 
tab_widget.addTab(tab5, "Grid 5") 
tab_widget.addTab(tab6, "Grid 6") 
tab_widget.addTab(tab7, "Grid 7") 
tab_widget.addTab(tab8, "Grid 8") 
tab_widget.addTab(tab9, "Grid 9") 
tab_widget.addTab(tab10, "Grid 10")  

button1 = QtGui.QPushButton("button1") 
p1_vertical.addWidget(img1)
p2_vertical.addWidget(img2) 
p3_vertical.addWidget(img3) 
p4_vertical.addWidget(img4) 
p5_vertical.addWidget(img5) 
p6_vertical.addWidget(img6) 
p7_vertical.addWidget(img7) 
p8_vertical.addWidget(img8) 
p9_vertical.addWidget(img9)  
p10_vertical.addWidget(img10) 

Perhaps something like this:

d = {} 
for i in range(1,10):
    d["img{0}".format(i)]= pg.ImageView()

Answer 1

Create a custom widget class that does all the setup in its __init__:

class ImageViewTab(QtGui.QWidget):
    def __init__(self, parent=None)
        super(ImageViewTab, self).__init__(parent)
        layout = QtGui.QVBoxLayout(self)
        self.imageview = pg.ImageView(self)
        layout.addWidget(self.imageview)

then add instances of your widget to the tab-widget in a loop:

    tab_widget = QtGui.QTabWidget()
    for index in range(1, 11):
        widget = ImageViewTab(tab_widget)
        tab_widget.addTab(widget, 'Grid %s' % index)

After all the setup is done, you can use the QTabWidget.widget method access the widgets by index:

    widget = tab_widget.widget(4)
    widget.imageview.setImage(img)

The main benefit of this approach is that it is very flexible. You can add specialized methods to your custom class, create and emit custom signals, add slots, etc.

Answer 2

imgs = [pg.ImageView() for _ in range(10)]

tab_widget = QtGui.QTabWidget()

tabs = [QtGui.QWidget() for _ in range(10)]

p_verticals = [QtGui.QVBoxLayout(tab) for tab in tabs]

for n, tab in enumerate(tabs):
    tab_widget.addTab(tab, "Grid {0}".format(n+1))

button1 = QtGui.QPushButton("button1")

for p, img in zip(p_verticals, imgs):
    p.addWidget(img)

I don't see why you would want to use a dictionary, lists are fine.

Answer 3

You can create all your variables in lists:

    imgs = [pg.ImageView() for _ in range(10)]
    tab_widget = QtGui.QTabWidget() 
    tabs = [QtGui.QWidget() for _ in range(10)]
    p_verticals = [QtGui.QVBoxLayout(tabs[i]) for i in range(10)]
    for i in range(10):
        tab_widget.addTab(tab[i], "Grid %d" % i+1) 
        p_verticals[i].addWidget(imgs[i])
    button1 = QtGui.QPushButton("button1")