Python – 使用 PyQt 的年龄计算器
在本文中，我们将了解如何使用 PyQt5 创建年龄计算器。
PyQt5是跨平台的 GUI 工具包，一组用于 Qt v5 的Python绑定。由于该库提供的工具和简单性，人们可以非常轻松地开发交互式桌面应用程序。它必须使用下面给出的命令安装
pip install PyQt5下面是年龄计算器的样子
GUI Implementation Steps :
1. Create a head label for the title of the game, set its properties
2. Create a date of birth label, below this label create QDateEdit object to receive the date and set their properties
3. Create a given date label, below this label create QDateEdit object to receive the new date and set their properties
4. Create a push button which when pressed date is calculated
5. Create result label to show the result i.e calculated age
Back-End implementation Steps :
1. Add action to the first QDateEdit when date is changed
2. Inside the first date edit action get the date of second date edit and set this date as maximum date of the first date edit
3. Add action to the second date edit when date is changed
4. Inside the second date edit action get the date of the first date edit and set this date as minimum date of the second date edit
5. Set different to the date edits such that first date should be less than second date
6. Add action to the push button
7. Inside the push button action, get the dates from both the date edits and calculate the difference and show the difference to the screen with the help of result label
下面是实现
# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
class Window(QMainWindow):
def __init__(self):
super().__init__()
# setting title
self.setWindowTitle("Age calculator")
# setting geometry
self.setGeometry(100, 100, 500, 400)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# method for components
def UiComponents(self):
# creating head label
head = QLabel("Age Calculator", self)
# setting geometry to the head
head.setGeometry(100, 10, 300, 60)
# font
font = QFont('Times', 14)
font.setBold(True)
font.setItalic(True)
font.setUnderline(True)
# setting font to the head
head.setFont(font)
# setting alignment of the head
head.setAlignment(Qt.AlignCenter)
head.setStyleSheet("color : green;")
# D.O.B label
dob = QLabel("Date of Birth", self)
# setting geometry
dob.setGeometry(0, 80, 250, 50)
# setting alignment and font
dob.setAlignment(Qt.AlignCenter)
dob.setFont(QFont('Times', 10))
# given date label
given = QLabel("Given Date", self)
# setting geometry
given.setGeometry(300, 80, 250, 50)
# setting alignment and font
given.setAlignment(Qt.AlignCenter)
given.setFont(QFont('Times', 10))
# creating a QDateEdit to get the d.o.b
self.first = QDateEdit(self)
# setting geometry
self.first.setGeometry(25, 130, 200, 50)
# setting font and alignment
self.first.setAlignment(Qt.AlignCenter)
self.first.setFont(QFont('Arial', 9))
# adding action to the first
# when date get change
self.first.dateChanged.connect(self.first_action)
# creating a QDateEdit to get the given date
self.second = QDateEdit(self)
# setting geometry
self.second.setGeometry(275, 130, 200, 50)
# setting font and alignment
self.second.setAlignment(Qt.AlignCenter)
self.second.setFont(QFont('Arial', 9))
# adding action to the second
# when date get change
self.second.dateChanged.connect(self.second_action)
# create a push button for calculate
calculate = QPushButton("Calculate", self)
# setting geometry to the push button
calculate.setGeometry(200, 210, 100, 40)
# setting color effect to the push button
color = QGraphicsColorizeEffect()
color.setColor(Qt.darkGreen)
calculate.setGraphicsEffect(color)
# adding action to the calculate button
calculate.clicked.connect(self.find_age)
# creating a result label to show the ans
self.result = QLabel(self)
# setting geometry
self.result.setGeometry(50, 280, 400, 80)
# setting style sheet and the font
self.result.setAlignment(Qt.AlignCenter)
self.result.setFont(QFont('Times', 12))
# setting stylesheet
self.result.setStyleSheet("QLabel"
"{"
"border : 2px solid black;"
"background : lightgrey;"
"}")
# making label multi line
self.result.setWordWrap(True)
# set dates to the first and second
self.first.setDate(QDate(2000, 1, 1))
self.second.setDate(QDate(2020, 1, 1))
# method called by the first date edit
def first_action(self):
# get the second date
date = self.second.date()
# set the maximum date in first
self.first.setMaximumDate(date)
# method called by the first date edit
def second_action(self):
# get the first date
date = self.first.date()
# set the maximum date in first
self.second.setMinimumDate(date)
# method called by the push button
def find_age(self):
# get the first age
get_Qdate1 = self.first.date()
birth_year = get_Qdate1.year()
birth_month = get_Qdate1.month()
birth_day = get_Qdate1.day()
# get the second age
get_Qdate2 = self.second.date()
given_year = get_Qdate2.year()
given_month = get_Qdate2.month()
given_day = get_Qdate2.day()
# if birth date is greater then given birth_month
# then donot count this month and add 30 to the date so
# as to subtract the date and get the remaining days
month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
if (birth_day > given_day):
given_month = given_month - 1
given_day = given_day + month[birth_month - 1]
# if birth month exceeds given month, then
# donot count this year and add 12 to the
# month so that we can subtract and find out
# the difference
if (birth_month > given_month):
given_year = given_year - 1
given_month = given_month + 12
# calculate day, month, year
calculated_day = given_day - birth_day
calculated_month = given_month - birth_month
calculated_year = given_year - birth_year
# setting text to the result
self.result.setText(str(calculated_day) + " Day(s), " + str(calculated_month)
+ " Month(s), " + str(calculated_year) + " Year(s)")
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())
输出 ：