How to change font size of child QLabel widget from the groupBox

Question

How can use different font & size for the child Widgets in the GroupBox and the tittle for the GroupBox in python

def panel(self):
    groupBox = QtGui.QGroupBox("voltage Monitor")
    groupBox.setFont(QtGui.QFont('SansSerif', 13))       # the title size is good
    ..

    self.Voltage_Label = []
    ..

    vbox = QtGui.QGridLayout()
    self.Voltage_Label.append(QtGui.QLabel("voltage1 ")) # i need to have diff Font & size for these 
    self.Voltage_Label.append(QtGui.QLabel("voltage2 "))   
    self.Voltage_Label.append(QtGui.QLabel("voltage3 ")) 
    ..
    vbox.addWidget(self.Voltage_Label[i], i, 0)  
    ..
    groupBox.setLayout(vbox)
    return groupBox

I tired this

   self.Voltage_Label.setFont(QtGui.QFont('SansSerif', 10))

I get this error

    !! self.Voltage_Label.setFont(QtGui.QFont('SansSerif', 10))
AttributeError: 'list' object has no attribute 'setFont' !!

但对于像这样title1 = QtGui.QLabel("Sample Title")的儿童小部件,我可以改变它

 title1.setFont(QtGui.QFont('SansSerif', 10))

Answer 1

当我在等待答案时,我想尝试一下,并为我的问题找到了这个方法/解决方案:

self.Voltage_Label = []

self.Voltage_Label.append(QtGui.QLabel("voltage1 ")) # i need to have diff Font & size for these 
self.Voltage_Label.append(QtGui.QLabel("voltage2 "))   
self.Voltage_Label.append(QtGui.QLabel("voltage3 "))
.
.

for i in xrange(5):
        newfont = QtGui.QFont("Times", 8, QtGui.QFont.Bold) 
        self.Voltage_Label[i].setFont(newfont)

Answer 2

您试图调用setFont()类的对象的方法list（没有这个方法），而不是QtGui.QLabel对象的方法。

您可以使用列表理解来获得更好的可扩展性和性能：

voltages = ["voltage1 ", "voltage2 ", "voltage3 "]

# Populates the list with QLabel objects
self.Voltage_Label = [QtGui.QLabel(x) for x in voltages]

# Invokes setFont() for each object
[x.setFont(QtGui.QFont("Times", 8, QtGui.QFont.Bold)) for x in self.Voltage_Label]

如果您需要更多电压标签，您只需修改列表voltages。

然后甚至：

[vbox.addWidget(self.Voltage_Label[i], i, 0) for i in range(len(self.Voltage_Label))]