QLineEdit:: QLineEdit (const QString &contents, QWidget *parent = nullptr) Constructs a line edit containing the text contents . The cursor position is set to the end of the line and the maximum text length to 32767 characters. Python PyQt5.QtWidgets 模块， QSizePolicy() 实例源码. 我们从Python开源项目中，提取了以下50个代码示例，用于说明如何使用PyQt5.QtWidgets.QSizePolicy()。 Understanding PyQt. PyQt is a Python binding for Qt, which is a set of C++ libraries and development tools that include platform-independent abstractions for Graphical User Interfaces (GUI), as well as networking, threads, regular expressions, SQL databases, SVG, OpenGL, XML, and many other powerful features. import sys from PyQt5.QtWidgets import *. self.tbox = QLineEdit(self). self.labl.setFixedSize(150,30).