Engaged in embedded systems software and hardware design work we have to do 20 years, during a hardware target board debugging, often require PC software support. During PC software program design, too VB, VB.net and C ++ and other languages, Python found by chance, after exposure, it immediately felt strong, and now my only PC software programming with Python . This series of tutorials from the perspective of hardware-based PC software designed to proceed, the system introduces the Python language, I hope the reader through this tutorial series, can immediately apply their knowledge of the Python language, to really apply the knowledge to the project practice.
Development Environment: Visual Studio Code
Operating System: Microsoft Window 7
Python Version: 3.7
Reference materials: Python quick introductory programming, programmers dark horse, the People's Posts and Telecommunications Press, September 2017 First Edition
Note: The tutorial is only for beginners, experts please bypass
A digital input determination is positive, zero, or negative
1, PyQt interface design:
2, object naming:
3, source:
# 系统包
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
# 项目包
from Ui_MainWindow import Ui_MainWindow
class CMainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent = None):
super(CMainWindow, self).__init__(parent)
self.setupUi(self)
# 主窗体设置
self.show()
def Judge(self):
a = int(self.txtNumber.text())
if a >= 0:
if a == 0:
self.labResult.setText("结果：你输入的数字是0")
else:
self.labResult.setText("结果：你输入的数字是正数")
else:
self.labResult.setText("结果：你输入的数字是负数")
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
MainWindow = CMainWindow()
sys.exit(app.exec_())
4. Note:
(1) in the general form of Python if statement is as follows:
if condition_1:
statement_block_1
elif condition_2:
statement_block_2
else:
statement_block_3
(2) To the back of each condition colon: it indicates the following condition is satisfied after the statement block to be executed.
(3) using indentation divided statement blocks, the number of statements in the same indentation together to form a block.
(4) there is no switch in Python - case statement.
5. Exercise:
Write a program conversion dog's age corresponds to the person's age, the algorithm: 0-year-old dog = "less than 14 years of age; 1 year old dog =" 14 years of age; 2-year-old dog = "22 years old; 2 years old dog conversion formula of human = 22 + (age -2) * 5.
Second, find the maximum number of three-digit
1, PyQt interface design:
2, object naming:
3, source:
# 系统包
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
# 项目包
from Ui_MainWindow import Ui_MainWindow
class CMainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent = None):
super(CMainWindow, self).__init__(parent)
self.setupUi(self)
# 主窗体设置
self.show()
def Max(self):
a = int(self.txtNumber1.text())
b = int(self.txtNumber2.text())
c = int(self.txtNumber3.text())
max = a
if max < b:
max = b
if max < c:
max = c
self.txtMaxNumber.setText(str(max))
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
MainWindow = CMainWindow()
sys.exit(app.exec_())
4. Exercise
Write a program, find the maximum number of four numbers.
任何问题，只需在此文章的评论处留言即可，我将尽力解答，不要试图采用其它的联系方式，我一概不理会。
原创性文章，转载请注明出处CSDN：http://blog.csdn.net/qingwufeiyang12346。