十、PyQt5 QLabel文字设置上标，下标的方法

PyQt5 QLabel文字设置上标，下标应使用html结构语法，具体使用方法如下：

上标：<sup>上浮内容</sup>
下标：<sub>下浮内容</sub>

下面用个小例子演示，输入x值，计算x²和log₁₀x，代码如下（第22、28行）：

 1 from PyQt5.QtWidgets import QWidget, QApplication, QLabel, QLineEdit,QVBoxLayout, QHBoxLayout
 2 from PyQt5.QtCore import QRegExp
 3 from PyQt5.QtGui import QRegExpValidator,QIntValidator
 4 import sys,math
 5 
 6 class MyWin(QWidget):
 7 
 8     def __init__(self):
 9         super(MyWin, self).__init__()
10         self.setWindowTitle('上下标小例子')
11         self.setGeometry(500, 400, 300, 250)
12 
13         self.ui_init()
14 
15     def ui_init(self):
16         lbl_x=QLabel('请输入一个正整数：x =',self)
17         line_x=QLineEdit()
18         hbx1=QHBoxLayout()
19         hbx1.addWidget(lbl_x)
20         hbx1.addWidget(line_x)
21 
22         lbl_xx = QLabel('x<sup>2</sup>=', self)
23         line_xx = QLineEdit()
24         hbx2 = QHBoxLayout()
25         hbx2.addWidget(lbl_xx)
26         hbx2.addWidget(line_xx)
27 
28         lbl_log10x = QLabel('log<sub>10</sub>x=', self)
29         line_log10x = QLineEdit()
30         hbx3 = QHBoxLayout()
31         hbx3.addWidget(lbl_log10x)
32         hbx3.addWidget(line_log10x)
33 
34         vbx=QVBoxLayout()
35         vbx.addLayout(hbx1)
36         vbx.addLayout(hbx2)
37         vbx.addLayout(hbx3)
38         self.setLayout(vbx)
39 
40         pIntvalidator = QIntValidator(self)
41         pIntvalidator.setRange(1, 99)
42         line_x.setValidator(pIntvalidator)
43 
44         line_x.textChanged.connect(lambda:self.show_result(line_x,line_xx,line_log10x))
45 
46     def show_result(self,line_x,line_xx,line_log10x):
47         x = int(line_x.text())
48         xx=x**2
49         log10x=math.log(x,10)
50         line_xx.setText(str(xx))  #一定要转成字符串再赋值
51         line_log10x.setText(str(log10x))
52 
53 
54 
55 if __name__ == '__main__':
56     app = QApplication(sys.argv)
57     win = MyWin()
58     win.show()
59     sys.exit(app.exec_())

效果图如下：

原文地址：https://www.cnblogs.com/chuanxiaopang/p/12886994.html