Understanding and application of Qt5 layout in creation

The core of programming

In order to skillfully learn and understand the important role of the program , We need to constantly design different types of works , So as to realize the skills and methods of programming .

from PyQt5.Qt import *
import sys
app = QApplication([])
class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle('DT System ')
        self.resize(1248,450)
        qr = self.frameGeometry()
        cp = QDesktopWidget().availableGeometry().center()
        qr.moveCenter(cp)
        
        # In vertical layout   Add horizontal layout , first floor 
        layout = QVBoxLayout()
        top_lout = QHBoxLayout() # Top level horizontal layout 
        btn_start = QPushButton()
        btn_start.setText(' Start ')
        top_lout.addWidget(btn_start) # Buttons are added to the layout 

        btn_stop = QPushButton()
        btn_stop.setText(' stop it ')
        top_lout.addWidget(btn_stop)
        top_lout.addStretch() # Add a spring on the right side to make the two buttons close to the left 
        layout.addLayout(top_lout) # The top-level layout is added to the general layout 
        layout.addStretch() # Add a spring to the general layout , Before making 2 A horizontal layout faces up .

        mid_lout = QHBoxLayout() # Middle horizontal layout 
        le = QLineEdit()
        mid_lout.addWidget(le)   # Add a text input box to the middle horizontal layout 

        btn_stop = QPushButton()
        btn_stop.setText(' add to ')
        mid_lout.addWidget(btn_stop) # Add buttons to the middle horizontal layout 
        layout.addLayout(mid_lout) # The middle horizontal layout is added to the general layout 


        # Create table layout 
        table_layout = QHBoxLayout()
        tw = QTableWidget(0, 8) # add to 2 That's ok , total 8 Column 
        table_header = [
            {"field":"asin","text":"ASIN",'width':120},
            {"field":"title","text":" title ",'width':150},
            {"field":"url","text":"URL",'width':400},
            {"field":"price","text":" Floor price ",'width':100},
            {"field":"success","text":" Number of successes ",'width':100},
            {"field":"error","text":"503 frequency ",'width':100},
            {"field":"status","text":" state ",'width':100},
            {"field":"frequency","text":" frequency (N second / Time )",'width':100}]
        for idx,info in enumerate(table_header):

            item = QTableWidgetItem()
            item.setText(info['text']) # Get the dictionary through a loop key='Text' Value 
            tw.setHorizontalHeaderItem(idx, item) #idx from 0-7, matching 1~8 Column ,item Is the corresponding text As column name 
            tw.setColumnWidth(idx, 112)

        item = QTableWidgetItem()
        item.setText(' website ')
        tw.setHorizontalHeaderItem(1, item)
        tw.setColumnWidth(1, 400)

        table_layout.addWidget(tw)
        layout.addLayout(table_layout)
        layout.addStretch() # Add springs to the general layout 

        bottom_lout = QHBoxLayout() # A horizontal area at the bottom 
        bottom_lout.addStretch() # Squeeze command added on the left 
        lab = QLabel(' A literary creation ： Teacher Detian ') # Align to the right under the squash command above 
        bottom_lout.addWidget(lab) # The label is added to the bottom horizontal area 
        layout.addLayout(bottom_lout)

        self.setLayout(layout) # Layout and window binding , Display... Through the window 

win = Window()
win.show()
sys.exit(app.exec_())