import sysfrom PyQt4.QtGui import *from PyQt4.QtCore import *class Calculate(QDialog): ???def __init__(self,parent=None): ???????super(Calculate,self).__init__(parent) ???????self.browser = QTextBrowser() ???????self.line_edit = QLineEdit(‘Type an expression an press Enter‘) ???????self.line_edit.setFocusPolicy(Qt.StrongFocus) ???????self.line_edit.selectAll() ???????layout = QVBoxLayout() ???????layout.addWidget(self.browser) ???????layout.addWidget(self.line_edit) ???????self.setLayout(layout) ???????self.setWindowTitle(‘Calculate‘) ???????self.connect(self.line_edit,SIGNAL(‘returnPressed ()‘),self.update_ui) ???def update_ui(self): ???????try: ???????????line_text = unicode(self.line_edit.text()) ???????????self.browser.append(‘%s = <b>%s</b>‘ %(line_text,eval(line_text))) ???????except: ???????????self.browser.append(‘<font color=red>%s is invalid!</font>‘ %(line_text)) ???????self.line_edit.selectAll()if __name__ == "__main__": ???app = QApplication(sys.argv) ???cal = Calculate() ???cal.show() ???sys.exit(app.exec_())
Pyqt使用html语法格式化输出控件内容
原文地址：https://www.cnblogs.com/hester/p/10442903.html