Question

python2.7

25 Points. Create a class named BMIGUI with the following behavior. A template has been provided for you and you cannot modify the template. You must use grid) to format the interface and you must get as close as possible the layout shown below. The entry box has a width parameter in its constructor you can use to make the box smaller 3. The BMI categories are as follows: Underweight= <18.5 Normal weight18.5-24.9 . Overweight 25-29.9 Obese BMI of 30 or greater . The BMI calculation can be simplifying as follows: BMI (Weight in Pounds/(Height in inches x Height in inches)) x 703 Hint: There are 12 inches in 1 foot BMI Calculator Body Mass Index Calculator Your Height Your Weight Feet Inches Pounds Calculate BM BMI: Notice the formatting of the result: BMI Calculator Body Mass Index Calculator Your Height Your Weight Feet 8 Inches Pounds Calculate BMI BMI: 21.28 (Normal Weight) Note float values entered into the text boxes results in a custom error message for each field.

Answer 1

Solution

from tkinter import *
from tkinter import messagebox

class App(Tk):
    def __init__(self):
        Tk.__init__(self)
        self.headerFont = ("Comic Sans", "16", "bold italic")

        self.title("BMI Calculator")
        self.setInfo()

    def setInfo(self):
        Label(self, text="BMI Calculator",
              font=self.headerFont).grid(columnspan=6)

        # get user's height
        Label(self, text="Height (ft)").grid(row=1, column=0)
        self.txtHeightFt = Entry(self)
        self.txtHeightFt.grid(row=1, column=1)
        # using the insert function to default all fields to "0"


        Label(self, text="  Height (in)").grid(row=1, column=3)
        self.txtHeightIn = Entry(self)
        self.txtHeightIn.grid(row=1, column=4)


        # get user's weight
        Label(self, text="Weight (lbs)").grid(row=2, column=0)
        self.txtWeight = Entry(self)
        self.txtWeight.grid(row=2, column=1)


        # label for BMI output and status
        Label(self, text="Your BMI:").grid(row=5, column=0)
        self.lblBMI = Label(self, bg="#fff", anchor="w", relief="groove")
        self.lblBMI.grid(row=5, column=1, sticky="we")
        Label(self, text="You are:").grid(row=5, column=3)
        self.lblBMIStatus = Label(self)
        self.lblBMIStatus.grid(row=5, column=4)

        # button to calculate info
        self.btnCalc = Button(self, text="Calculate BMI")
        self.btnCalc.grid(row=10, columnspan=5)
        self.btnCalc["command"] = self.calcBMI

    def calcBMI(self):
        """calculate the BMI of a person using the formula"""

        # calculate BMI
        try:
            feet = int(self.txtHeightFt.get())
        except ValueError as v:
            messagebox.showerror("BMI Calculation ", "Error. Incorrect value entered for height(feet).")
            a.destroy()
            main()

        try:
            inches = int(self.txtHeightIn.get())
        except ValueError as v:
            messagebox.showerror("BMI Calculation ", "Error. Incorrect value entered for height(inches).")
            a.destroy()
            main()

        try:
            weight = int(self.txtWeight.get())
        except ValueError as v:
            messagebox.showerror("BMI Calculation ", "Error. Incorrect value entered for height(feet).")
            a.destroy()
            main()

        # BMI needs to be a float, int * float is float
        totalHeight = (12 * int(feet)) + int(inches)
        bmi = int(weight) * 703 / (totalHeight * totalHeight)

        self.lblBMI["text"] = "%.2f" % bmi

        # label for BMI status

        if bmi < 18.5:
            self.lblBMIStatus["text"] = "Underweight"
        elif bmi < 24.9:
            self.lblBMIStatus["text"] = "Normal Weight"
        elif bmi < 29.9:
            self.lblBMIStatus["text"] = "Overweight"
        else:
            self.lblBMIStatus["text"] = "Obese"


def main():
    global a
    a = App()
    a.mainloop()


if __name__ == "__main__":
    main()

Feel free to reach out regarding any queries. And please do rate the answer . Thank you .

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