# Rank Based Percentile Gui Calculator using Tkinter

Python offers multiple options for developing a GUI (Graphical User Interface). Out of all the GUI methods, Tkinter is the most commonly used method. In this article, we will learn how to create Rank Based – Percentile Gui Calculator application using Tkinter, with a step-by-step guide.

To create a Tkinter:

• Importing the module – tkinter
• Create the main window (container)
• Add any number of widgets to the main window.
• Apply the event Trigger on the widgets.

Let’s create a GUI based simple Rank Based – Percentile Gui Calculator application :

Below is the implementation :

 `# import all functions from the tkinter     ` `from` `tkinter ``import` `*` ` `  `  `  `# Function to calculate the percentile   ` `def` `getPercentile() : ` `  `  `    ``# take a value from the respective entry boxes  ` `    ``# get method returns current text as string  ` `    ``students``=` `int``(total_participantField.get()) ` `      `  `    ``rank ``=` `int``(rankField.get()) ` `  `  `    ``# variable to store the result upto 3 ` `    ``# decimal points   ` `    ``result ``=` `round``((students ``-` `rank) ``/` `students ``*` `100``,``3``); ` `  `  `    ``# insert method inserting the    ` `    ``# value in the text entry box.  ` `    ``percentileField.insert(``10``, ``str``(result))  ` `    `  `      `  `# Function for clearing the    ` `# contents of all text entry boxes  ` `def` `Clear(): ` `      `  `    ``# deleting the content from the entry box  ` `    ``rankField.delete(``0``, END) ` `      `  `    ``total_participantField.delete(``0``, END) ` `      `  `    ``percentileField.delete(``0``, END) ` `      `  `  `  `# Driver Code ` `if` `__name__ ``=``=` `"__main__"` `: ` `  `  `    ``# Create a GUI window  ` `    ``gui ``=` `Tk()  ` `    `  `    ``# Set the background colour of GUI window    ` `    ``gui.configure(background ``=` `"light green"``)  ` `    `  `    ``# set the name of tkinter GUI window   ` `    ``gui.title(``"Rank Based- Percentile Calculator"``)  ` `    `  `     ``# Set the configuration of GUI window  ` `    ``gui.geometry(``"650x200"``)  ` `  `  `    ``# Create a Rank: label   ` `    ``rank ``=` `Label(gui, text ``=` `"Rank"``, bg ``=` `"blue"``) ` `  `  `    ``# Create a And: label   ` `    ``andl ``=` `Label(gui, text ``=` `"And"``, bg ``=` `"blue"``) ` `    `  `    ``# Create a Total Participants : label  ` `    ``total_participant ``=` `Label(gui,  ` `                              ``text ``=` `"Total Participants"``,  ` `                              ``bg ``=` `"blue"``)  ` `  `  `    ``# Create a Find Percentile Button and  ` `    ``# attached to getPercentile function  ` `    ``find ``=` `Button(gui, text ``=` `"Find Percentile"``,  ` `                  ``fg ``=` `"Black"``, bg ``=` `"Red"``, ` `                  ``command ``=` `getPercentile) ` `      `  `    ``# Create a Percentile : label   ` `    ``percentile ``=` `Label(gui, text ``=` `"Percentile"``, bg ``=` `"blue"``)  ` `  `  `    ``# Create a Clear Button and attached  ` `    ``# to Clear function  ` `    ``clear ``=` `Button(gui, text ``=` `"Clear"``, ` `                   ``fg ``=` `"Black"``, bg ``=` `"Red"``, ` `                   ``command ``=` `Clear)  ` `  `  `    ``# grid method is used for placing    ` `    ``# the widgets at respective positions    ` `    ``# in table like structure . ` `  `  `    ``# padx attributed provide x-axis margin   ` `    ``# from the root window to the widget.  ` `    ``rank.grid(row ``=` `1``, column ``=` `1``,padx ``=` `10``) ` `  `  `    ``andl.grid(row ``=` `1``, column ``=` `4``) ` `                   `  `    ``total_participant.grid(row ``=` `1``, column ``=` `6``, padx ``=` `10``) ` `  `  `    ``# pady attributed provide y-axis  ` `    ``# margin from the widget.     ` `    ``find.grid(row ``=` `3``, column ``=` `4``,pady ``=` `10``) ` `      `  `    ``percentile.grid(row ``=` `4``, column ``=` `3``,padx ``=` `10``) ` `      `  `    ``clear.grid(row ``=` `5``, column ``=` `4``,pady ``=` `10``) ` `  `  `    ``# Create a text entry box for filling or ` `    ``# typing the information.    ` `    ``rankField ``=` `Entry(gui) ` `      `  `    ``total_participantField ``=` `Entry(gui) ` `      `  `    ``percentileField ``=` `Entry(gui) ` `  `  `    ``# grid method is used for placing    ` `    ``# the widgets at respective positions    ` `    ``# in table like structure .  ` `    ``rankField.grid(row ``=` `1``, column ``=` `2``) ` `      `  `    ``total_participantField.grid(row ``=` `1``, column ``=` `7``) ` `      `  `    ``percentileField.grid(row ``=` `4``, column ``=` `4``) ` `      `  `    ``# Start the GUI  ` `    ``gui.mainloop()  `

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