Prerequisites: 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.
python3
import tkinter as tkfrom tkinter import messageboxfrom functools import partial# Declaration of global variabletemp_Val = "Celsius"# getting drop down valuedef store_temp(set_temp): global temp_Val temp_Val = set_temp# Conversion of temperaturedef 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 windowroot = tk.Tk()# setting geometry of tk windowroot.geometry('300x150 + 600 + 200')# Using title() to display a message in the# dialogue box of the message in the title barroot.title('Temperature Converter')# Lay out widgetsroot.grid_columnconfigure(1, weight = 1)root.grid_rowconfigure(1, weight = 1)inputNumber = tk.StringVar()var = tk.StringVar()# label and entry fieldinput_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 setupdropDownList = ["Celsius", "Fahrenheit"]drop_down = tk.OptionMenu(root, var, *dropDownList, command = store_temp)var.set(dropDownList[0])drop_down.grid(row = 1, column = 2)# button widgetcall_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 occursroot.mainloop() |
Output:
