转:pyqt实例

在安装python3.4+pyserial2.7+pyqt5的时候,就按照这个顺序安装,如果每一个不好用,反向卸载,重新安装,且版本一定要匹配.

这个pyqt的例程是好用的:这里写链接内容
其主要代码如下:

import sys
from PyQt5 import QtWidgets, QtCore
app = QtWidgets.QApplication(sys.argv)
widget = QtWidgets.QWidget()
widget.resize(360, 360)
widget.setWindowTitle("Hello, PyQt5!")
widget.show()
sys.exit(app.exec_())

而这个却不行:这里写链接内容
代码如下:

import sys
from PyQt4 import QtGui

app = QtGui.QApplication(sys.argv)
widget = QtGui.QWidget()
widget.resize(250, 150)
widget.setWindowTitle('PyQt')
widget.show()
sys.exit(app.exec_())

对比发现,一个是QtWidgets.一个是用QtGui,,前者好用.注意到pyqt的版本不一样,这可能是原因.

下面这个例子也很好:
这里写链接内容
代码:

#!/usr/bin/python3
#coding:utf-8

from PyQt5.QtWidgets import *
import sys

class LoginDlg(QDialog):
    def __init__(self, parent=None):
        super(LoginDlg, self).__init__(parent)
        usr = QLabel("用户：")
        pwd = QLabel("密码：")
        self.usrLineEdit = QLineEdit()
        self.pwdLineEdit = QLineEdit()
        self.pwdLineEdit.setEchoMode(QLineEdit.Password)

        gridLayout = QGridLayout()
        gridLayout.addWidget(usr, 0, 0, 1, 1)
        gridLayout.addWidget(pwd, 1, 0, 1, 1)
        gridLayout.addWidget(self.usrLineEdit, 0, 1, 1, 3);
        gridLayout.addWidget(self.pwdLineEdit, 1, 1, 1, 3);

        okBtn = QPushButton("确定")
        cancelBtn = QPushButton("取消")
        btnLayout = QHBoxLayout()

        btnLayout.setSpacing(60)
        btnLayout.addWidget(okBtn)
        btnLayout.addWidget(cancelBtn)

        dlgLayout = QVBoxLayout()
        dlgLayout.setContentsMargins(40, 40, 40, 40)
        dlgLayout.addLayout(gridLayout)
        dlgLayout.addStretch(40)
        dlgLayout.addLayout(btnLayout)

        self.setLayout(dlgLayout)
        okBtn.clicked.connect(self.accept)
        cancelBtn.clicked.connect(self.reject)
        self.setWindowTitle("登录")
        self.resize(300, 200)

    def accept(self):
        if self.usrLineEdit.text().strip() == "eric" and self.pwdLineEdit.text() == "eric":
            super(LoginDlg, self).accept()
        else:
            QMessageBox.warning(self,
                    "警告",
                    "用户名或密码错误！",
                    QMessageBox.Yes)
            self.usrLineEdit.setFocus()

app = QApplication(sys.argv)
dlg = LoginDlg()
dlg.show()
dlg.exec_()
app.exit()