Creating a GUI in Python

Title of Lab: Creating a GUI in Python

Summary

This week’s lab is to create a GUI in python and use the tkinter module

Use text boxes to retrieve the speed and time traveled (in minutes) from the user. From this calculate the distance traveled: distance  = rate * time

Deliverables

•             A source code Python file.

•             A Word document containing both source code and the screen print of the program outputs.

Lab Steps

Sample Output:

The output should be something similar to the following.

Hints:

•             The following code below is an implementation of a GUI to solve for miles per gallon. Use the code from the example below calculating miles per gallon, and modify it to display the distance traveled.

•             Instead of asking the user for miles driven and gas. You will need to ask for Time driving and Speed. You will also need to modify the formula.

importtkinter as tk

fromtkinter import ttk

defclick_calculateButton():

miles = float( milesText.get() )    # get miles driven from the miles textfield

gas = float( gasText.get() )        # get gas used from the gas textfield

mpg = miles / gas                   # do the math!

mpgText.set( round(mpg,1) )         # display the output

defcommand_exitButton():

root.destroy()

# create root window

root = tk.Tk()

root.title(“MPG Calculator”)

root.geometry(“280×150”)    # size of window

# create frame and add it to the root window

frame = ttk.Frame(root, padding=”10 10 10 10″)

frame.pack(fill=tk.BOTH, expand=True)

# create labels and textfields

ttk.Label(frame, text=”Miles Driven:”).grid(column=0, row=0, padx=5, pady=5, sticky=tk.E)  # display label in grid

milesText = tk.StringVar()

ttk.Entry(frame, width=25, textvariable=milesText).grid(column=1, row=0)

ttk.Label(frame, text=”Gas Used:”).grid(column=0, row=1, padx=5, pady=5, sticky=tk.E)

gasText = tk.StringVar()

ttk.Entry(frame, width=25, textvariable=gasText).grid(column=1, row=1)

# create a button and add it to the window

ttk.Button(frame, text=”Calculate”, command=click_calculateButton).grid(column=0, row=2, padx=5, pady=5, sticky=tk.E)

ttk.Button(frame, text=”Exit”, command=command_exitButton).grid(column=1, row=2, padx=5, pady=5, sticky=tk.W)

ttk.Label(frame, text=”MPG:”).grid(column=0, row=3, padx=5, pady=5, sticky=tk.E)

mpgText = tk.StringVar()

mpgEntry = ttk.Entry(frame, width=25, textvariable=mpgText, state=”readonly”).grid(column=1, row=3) # notice readonly!

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