Chapter 14: Graphical User Interfaces (Solutions to Even-Numbered Exercises)
Question 2
from Tkinter import *
def increase(value):
value.set(value.get() + 1)
window = Tk()
value = IntVar()
button = Button(window, textvariable=value, command=lambda: increase(value))
button.pack()
window.mainloop()
Question 4
from Tkinter import *
def dnacount(dna, count):
a = 0
t = 0
c = 0
g = 0
sequence = dna.get(0.0, END)
for letter in sequence:
if letter == "A":
a += 1
elif letter == "T":
t += 1
elif letter == "C":
c += 1
elif letter == "G":
g +=1
count.set("Num As: " + str(a) + " Num Ts:" + str(t) + " Num Cs:" + str(c) + " Num Gs:" + str(g))
window = Tk()
frame = Frame(window)
frame.pack()
dna = Text(frame, height=8, width=30)
dna.pack()
button = Button(frame, text="Count", command=lambda: dnacount(dna, count))
button.pack()
count = StringVar()
result = Label(frame, textvariable=count)
result.pack()
window.mainloop()