Temperature Converter using Tkinter

Last Updated : 29 Dec, 2020

Prerequisistes: Python GUI – tkinter

Python Tkinter is a GUI programming package or built-in library. Tkinter provides the Tk GUI toolkit with a potent object-oriented interface. Python with Tkinter is the fastest and easiest way to create GUI applications. Creating a GUI using Tkinter is an easy task.

Approach:

Importing the module – tkinter, functools from partial
Create the main window
Add number of widgets to the main window:Button, Entry, Label
Displaying message
Apply the event trigger on the widgets.

Below is the implementation.

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() 

Output:

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