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PyQt4内容整理一

Prentice.Hall.Rapid.GUI.Programming.with.Python.and.Qt.the.definitive.guide.to.PyQt.programming.2008.pdf 里面的例子实现。
第四章全部例子：window测试通过
图片和代码的顺序不是一致的，不过应该很容易看出来，然后有些例子做了一些改动，比如下面第一张图。
  1 import sys
  2 import time
  3 from PyQt4.QtCore import *
  4 from PyQt4.QtGui import *
  5 
  6 app=QApplication(sys.argv)
  7 try:
  8     
  9     due=QTime.currentTime()
 10     message='Alter'
 11     if len(sys.argv) <2:
 12     raise ValueError
 13     hours,mins = sys.argv[1].split(":")
 14     due=QTime(int(hours),int(mins))
 15     if len(sys.argv) >=2:
 16     message = ''.join(sys.argv[2:])
 17 except ValueError:
 18     message = 'Usage: alter.pyw HH:MM'
 19 while QTime.currentTime() <= due:
 20     time.sleep(20)
 21 label = QLabel('<font color=red size=72 ><b>message</b></font>')
 22 label.setWindowFlags(Qt.SplashScreen)
 23 label.show()
 24 QTimer.singleShot(6000,app.quit)
 25 app.exec_()
 26 
 27 -------------------------------------------------------------------------
 28 
 29 # -*- coding: utf-8 -*-
 30 from __future__ import division #引入真实除和数学的相关包
 31 import sys
 32 from math import *
 33 from PyQt4.QtCore import *
 34 from PyQt4.QtGui import *
 35 
 36 class Form(QDialog):
 37     def __init__(self,parent=None):
 38         super(Form,self).__init__(parent)
 39         self.setWindowTitle("TextBrowser")
 40         self.textbrowser = QTextBrowser()#QTextBrowser()只读的多行的文本框
 41         self.lineedit = QLineEdit("input your expression and press enter")
 42         self.lineedit.selectAll()#选中全部，注意里面没有参数，下面的setFocus()也没有参数
 43         self.lineedit.setFocus()
 44         layout = QVBoxLayout()
 45         layout.addWidget(self.textbrowser)
 46         layout.addWidget(self.lineedit)#要加self
 47         self.setLayout(layout)
 48         self.connect(self.lineedit,SIGNAL('returnPressed()'),self.lineeidt_change)#只写方法名，不要写括号
 49         #主要是要记得写self，总是忘记，这里有一个新的内置的signal：returnPressed()
 50     def lineeidt_change(self): 
 51         try:
 52             text = unicode(self.lineedit.text())
 53             #self.lineedit.text()获得文本内容
 54             self.textbrowser.append("%s = %s" % (text,eval(text)))#使用append方法进行追加
 55         except:
 56             self.textbrowser.append("<font color=red size =20>%s Error </font>" % str(text)) #格式化符号写在外面,<font>要写在引号里面
 57 app = QApplication(sys.argv)
 58 form = Form()
 59 form.show()
 60 app.exec_() #这个是app的结束，不是sys.
 61         
 62 --------------------------------------------------------------------------------
 63 import sys
 64 from PyQt4.QtCore import *
 65 from PyQt4.QtGui import *
 66 from datetime import date
 67 
 68 class Form(QDialog):
 69     def __init__(self,parent=None):
 70         super(Form,self).__init__(parent)
 71         self.mdict = {'a':10 ,'b':20, 'c':30}
 72         self.setWindowTitle("windows")
 73         self.label_date = QLabel(date.taday().strfTime("%Y-%m-%d"))
 74         self.comboBox1 = QComboBox()
 75         self.comboBox1.addItems(sorted(self.mdict.keys()))
 76         self.comboBox2 = QComboBox()
 77         self.comboBox2.addItems(sorted(self.mdict.keys()))
 78         self.doubleSpinBox = QDoubleSpinBox()
 79         self.doubleSpinBox.setRange(0.1,100000)
 80         self.doubleSpinBox.setValue(1.0)
 81         self.label = QLabel("1.0")
 82 
 83         slef.connect(self.comboBox1,SIGNAL('currentIndexChanged(int)'),self.uichange)
 84         slef.connect(self.comboBox2,SIGNAL('currentIndexChanged(int)'),self.uichange)
 85         slef.connect(self.doubleSpinBox,SIGNAL('ValueChanged(double)'),self.uichange)
 86 
 87         layout =QGirdLayout()
 88         layout.addWidget(self.lable_date,0,0)
 89         layout.addWidget(self.comboBox1,1,0)
 90         layout.addWidget(self.comboBox2,1,1)
 91         layout.addWidget(self.doubleSpinBox,2,0)
 92         layout.addWidget(self.label,2,1)
 93 
 94         self.setLayout(layout)
 95     def uichange(self):
 96         text_b1 = unicode(self.comboBox1.currentText())
 97         text_b2 = unicode(self.comboBox2.currentText())
 98         try:
 99             self.label.setText(self.mdict[text_b1] * self.mdict(text_b2) * self.doubleSpinBox.value())
100         except:
101             
102             self.label.setText("<font color=red size = 20><b> ERROR</b></font>")
103 app = QApplication(sys.argv)
104 form = Form()
105 form.show()
106 app.exec_()
107         
108         
109         
110 ----------------------------------------------------------------------
111 # -*- coding: utf-8 -*-
112 import sys
113 from PyQt4.QtCore import *
114 from PyQt4.QtGui import *
115 from datetime import datetime
116 
117 class Form(QDialog):
118     def __init__(self,parent=None):
119         super(Form,self).__init__(parent)
120         self.mdict = {'a':10 ,'b':20, 'c':30}
121         self.setWindowTitle("windows")
122         self.label_date = QLabel(datetime.now().strftime("%Y-%m-%d"))#使用了strftime()方法进行了格式化，从datetime.datetime.now()得到现在的时间
123         self.comboBox1 = QComboBox() # QComboBox 下拉框，采用addItems()的方法增加下拉项，可以方便的使用字典的形式。currentText()方法得到现在的下拉项。
124         self.comboBox1.addItems(sorted(self.mdict.keys()))#sorted()复制字典的键
125         self.comboBox2 = QComboBox()
126         self.comboBox2.addItems(sorted(self.mdict.keys()))
127         self.doubleSpinBox = QDoubleSpinBox() #
128         self.doubleSpinBox.setRange(0.1,100000) # 0.1-100000范围，然后步长是1
129         self.doubleSpinBox.setValue(1.0) # 设置值
130         self.label = QLabel("1.0")
131         self.resize(350,200)
132 
133         self.connect(self.comboBox1,SIGNAL('currentIndexChanged(int)'),self.uichange) #特有的方法： currentIndexChanged(int) and valueChanged(double) 这有一些规律，比如首字母小写，驼峰记法，后面一般都是被动式加括号，里面有相应参数
134         self.connect(self.comboBox2,SIGNAL('currentIndexChanged(int)'),self.uichange)
135         self.connect(self.doubleSpinBox,SIGNAL('valueChanged(double)'),self.uichange)
136 
137         layout = QGridLayout()
138         layout.addWidget(self.label_date,0,0) # 添加组件的时候，要记得是绑定调用，即要用self实现对组件的调用，在gui中几乎所有的都要使用self显性的调用。
139         layout.addWidget(self.comboBox1,1,0)
140         layout.addWidget(self.comboBox2,1,1)
141         layout.addWidget(self.doubleSpinBox,2,0)
142         layout.addWidget(self.label,2,1)
143 
144         self.setLayout(layout)
145     def uichange(self):
146         text_b1 = unicode(self.comboBox1.currentText())
147         text_b2 = unicode(self.comboBox2.currentText())
148         try:
149             a= self.mdict[text_b1]
150             b= self.mdict[text_b2]
151             print '-----------'
152             c= self.doubleSpinBox.value() #得到doubleSpinBpx的值
153             
154             amount = a*b*c
155             print amount
156             self.label.setText('%s'% amount)
157         except:       
158             self.label.setText("<font color=red size = 20><b> ERROR</b></font>")
159 app = QApplication(sys.argv)
160 form = Form()
161 form.show()
162 app.exec_()
163         
164         
165         
166 --------------------------------------------------------------------------
167 import sys
168 from PyQt4.QtGui import *
169 from PyQt4.QtCore import *
170 
171 class Form2(QDialog):
172     def __init__(self,parent=None):
173         super(Form2,self).__init__(parent)
174         self.setWindowTitle("Test 2")
175         self.dial = QDial()
176         self.dial.setNotchesVisible(True)
177         self.spinbox = QSpinBox()
178 
179         layout = QHBoxLayout()
180         layout.addWidget(self.dial)
181         layout.addWidget(self.spinbox)
182 
183         self.setLayout(layout)
184 
185         self.connect(self.dial,SIGNAL('valueChanged(int)'),self.spinbox.setValue)
186         self.connect(self.spinbox,SIGNAL('valuechanged(int)'),self.dial.setValue)
187         
188 app = QApplication(sys.argv)
189 form = Form2()
190 form.show()
191 app.exec_()
192         
193 -----------------------------------------------------------------------------
194 import sys
195 from PyQt4.QtGui import *
196 from PyQt4.QtCore import *
197 
198 class Form3(QSpinBox):
199     def __init__(self):
200         self.times=0
201         super(Form3,self).__init__()
202         self.connect(self,SIGNAL('valueChanged(int)'),self.checkZero)
203         self.connect(self,SIGNAL('zeroTimes'),self.func)
204         self.resize(150,50)
205     def checkZero(self):
206         if self.value()==0:            
207             self.times+=1
208             self.emit(SIGNAL('zeroTimes'),self.times)
209                 
210     def func(self,times):
211         print '%s times' % times
212     
213 app = QApplication(sys.argv)
214 form = Form3()
215 form.show()
216 app.exec_()
217         
218 --------------------------------------------------------------------------------
219 import sys
220 from PyQt4.QtGui import *
221 from PyQt4.QtCore import *
222 
223 class Form4(QDialog):
224     def __init__(self):
225         super(Form4,self).__init__()
226         names=['one','two','three','four','five','six']
227         self.button1 = QPushButton(names[0])
228         self.button2 = QPushButton(names[1])
229         self.button3 = QPushButton(names[2])
230         self.button4 = QPushButton(names[3])
231         self.button5 = QPushButton(names[4])
232         self.button6 = QPushButton(names[5])
233 
234         layout = QHBoxLayout()
235         layout.addWidget(self.button1)
236         layout.addWidget(self.button2)
237         layout.addWidget(self.button3)
238         layout.addWidget(self.button4)
239         layout.addWidget(self.button5)
240         layout.addWidget(self.button6)
241         self.setLayout(layout)
242 
243         self.connect(self.button1,SIGNAL('clicked()'),lambda x=names[0] : self.myFunc(x))
244         self.connect(self.button2,SIGNAL('clicked()'),lambda x=names[1] : self.myFunc(x))
245         self.connect(self.button3,SIGNAL('clicked()'),lambda x=names[2] : self.myFunc(x))
246         self.connect(self.button4,SIGNAL('clicked()'),self.myClicked)
247         self.connect(self.button5,SIGNAL('clicked()'),self.myClicked)
248         self.connect(self.button6,SIGNAL('clicked()'),self.myClicked)
249     def myClicked(self):
250         button = self.sender()
251         #if button is None or not isinstance(button,QPushButton):
252         if button is None or not hasattr(button,'text'):
253             return
254         print 'the button clicked is button %s' % button.text()
255 
256 
257     def myFunc(self,name):
258         print 'the button clicked is button %s' % name
259         
260         
261         
262 
263     
264 app = QApplication(sys.argv)
265 form = Form4()
266 form.show()
267 app.exec_()
268         
269 -----------------------------------------------------------------------------------
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原文地址：https://www.cnblogs.com/me-qk/p/4121385.html