def kg_to_pounds_ounces_grams(kilogram):
    pound = kilogram * 2.20462
    oounce = kilogram * 35.274
    gram = kilogram * 1000
    return [pound, oounce, gram]

for textWidget,weight  in zip(output, kg_to_pounds_ounces_grams(kg) ):
    textWidget.delete(1.0, END)
    textWidget.insert(END,weight)

from tkinter import *

window = Tk()


def kg_to_pounds_ounces_grams(kilogram):
    pound = kilogram * 2.20462
    ounce = kilogram * 35.274
    gram = kilogram * 1000
    return [pound, ounce, gram]


def convert_button_pressed():
    try:
        kg = float(e1_text.get())
    except:
        kg = float("NaN")
    map(lambda x: x.delete(1.0, END), output)
    # Missing Code goes here!


l1 = Label(window, text="Kg")
l1.grid(row=0, column=0)

e1_text = StringVar()
e1 = Entry(window, textvariable=e1_text)
e1.grid(row=0, column=1)

b1 = Button(window, text="Convert", command=convert_button_pressed)
b1.grid(row=0, column=2)

t1 = Text(window, height=1, width=20)
t1.grid(row=1, column=0)

t2 = Text(window, height=1, width=20)
t2.grid(row=1, column=1)

t3 = Text(window, height=1, width=20)
t3.grid(row=1, column=2)

output = [t1, t2, t3]

window.mainloop()

[x.delete(1.0, END) for xin output]

[x.insert(END, w) for x, w in zip(output, kg_to_pound_ounces_grams(kg))]

[(x.delete(1.0, END), x.insert(END, w)) for x, w in zip(output, kg_to_pound_ounces_grams(kg))]