使用 Tkinter 的温度转换器

先决条件： Python GUI – tkinter
Python Tkinter 是一个 GUI 编程包或内置库。 Tkinter 为 Tk GUI 工具包提供了强大的面向对象接口。带有 Tkinter 的Python是创建 GUI 应用程序的最快和最简单的方法。使用 Tkinter 创建 GUI 是一项简单的任务。
方法：

• 导入模块 – tkinter, functools from partial
• 创建主窗口
• 向主窗口添加多个小部件：Button、Entry、Label
• 显示信息
• 在小部件上应用事件触发器。

下面是实现。

python3

import tkinter as tk
from tkinter import messagebox
from functools import partial
 
 
# Declaration of global variable
temp_Val = "Celsius"
 
# getting drop down value
def store_temp(set_temp):
    global temp_Val
    temp_Val = set_temp
 
# Conversion of  temperature
def call_convert(rlabel1,  inputn):
    temp = inputn.get()
     
    if temp_Val == 'Celsius':
         
        # Conversion of celsius temperature to fahrenheit
        f = float((float(temp) * 9 / 5) + 32)
        rlabel1.config(text ="%.1f Fahrenheit" % f)
        messagebox.showinfo("Temperature Converter",
                            "Successfully converted to Fahrenheit ", )
         
    if temp_Val == 'Fahrenheit':
         
        # Conversion of fahrenheit temperature
        # to celsius
        c = float((float(temp) - 32) * 5 / 9)
        rlabel1.config(text ="%.1f Celsius" % c)
        messagebox.showinfo("Temperature Converter",
                            "Successfully converted to Celsius ")
    return
 
 
# creating Tk window
root = tk.Tk()
 
# setting geometry of tk window
root.geometry('300x150 + 600 + 200')
 
# Using title() to display a message in the
# dialogue box of the message in the title bar
root.title('Temperature Converter')
 
# Lay out widgets
root.grid_columnconfigure(1, weight = 1)
root.grid_rowconfigure(1, weight = 1)
 
inputNumber = tk.StringVar()
var = tk.StringVar()
 
# label and entry field
input_label = tk.Label(root, text ="Enter temperature")
input_entry = tk.Entry(root, textvariable = inputNumber)
input_label.grid(row = 1)
input_entry.grid(row = 1, column = 1)
result_label = tk.Label(root)
result_label.grid(row = 3, columnspan = 4)
 
# drop down setup
dropDownList = ["Celsius", "Fahrenheit"]
drop_down = tk.OptionMenu(root, var, *dropDownList,
                          command = store_temp)
var.set(dropDownList[0])
drop_down.grid(row = 1, column = 2)
 
# button widget
call_convert = partial(call_convert, result_label,
                       inputNumber)
result_button = tk.Button(root, text ="Convert",
                          command = call_convert)
result_button.grid(row = 2, columnspan = 2)
 
# infinite loop which is required to
# run tkinter program infinitely
# until an interrupt occurs
root.mainloop()

输出：