Solved all chapter 9 problems

Author: LambdaDrive

Chapter 9/Exercise9_10.py

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+from tkinter import Tk, PhotoImage, Label, RIGHT, LEFT
+
+root = Tk()
+picture = PhotoImage(file='Rotating_earth_(large).gif')
+imagem = Label(master=root,image=picture)
+imagem.pack(side=RIGHT)
+text = Label(text='Terra \n 23487283742830947 anos')
+text.pack(side=LEFT)
+
+root.mainloop()

Chapter 9/Exercise9_11.py

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+from tkinter import Tk, Button, LEFT, RIGHT
+from time import strftime, localtime, gmtime
+from tkinter.messagebox import showinfo
+
+def greenwich():
+    'prints Greenwich day and time info'
+    time = strftime('Day:  %d %b %Y\nTime: %H:%M:%S %p\n',
+                    gmtime())
+    showinfo(message='Greenwich time\n' + time)
+
+def local():
+    'prints local day and time info'
+    time = strftime('Day:  %d %b %Y\nTime: %H:%M:%S %p\n',
+                    localtime())
+    showinfo(message='Local time\n' + time)
+
+root = Tk()
+
+# Local time button
+buttonl = Button(root,
+                 text='Local time',
+                 command=local)
+
+# Greenwich mean time button
+buttong = Button(root,
+                 text='Greenwich time',
+                 command=greenwich)
+
+buttonl.pack(side = LEFT)
+buttong.pack(side = RIGHT)
+root.mainloop()

Chapter 9/Exercise9_12.py

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+from tkinter import Tk, Label, RAISED, Button
+root = Tk()
+labels = [['1', '2', '3'],     # phone dial label texts
+          ['4', '5', '6'],     # organized in a grid
+          ['7', '8', '9'],
+          ['*', '0', '#']]
+
+def imprint(text):
+    print(text)
+for r in range(4):      # for every row r = 0, 1, 2, 3
+    for c in range(3):      # for every row c = 0, 1, 2
+        # create label for row r and column c
+        button = Button(root,
+                      relief=RAISED,      # raised border
+                      padx=10,            # make label wide
+                      text=labels[r][c],  # label text  
+                      command=lambda text=labels[r][c]:imprint(text))
+        
+        # place label in row r and column c
+        button.grid(row=r, column=c)
+
+root.mainloop()

Chapter 9/Exercise9_13.py

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+from tkinter import Tk, Canvas, Frame, Button, SUNKEN, LEFT, RIGHT
+
+
+
+# event handlers
+def up(Event=0):
+    'move pen up 10 pixels'
+    global y, canvas                  # y is modified
+    canvas.create_line(x, y, x, y-10)
+    y -= 10
+
+def down(Event=0):
+    'move pen down 10 pixels'
+    global y, canvas                  # y is modified
+    canvas.create_line(x, y, x, y+10)
+    y += 10
+
+def left(Event=0):
+    'move pen left 10 pixels'
+    global x, canvas                  # x is modified
+    canvas.create_line(x, y, x-10, y)
+    x -= 10
+
+def right(Event=0):
+    'move pen right 10 pixels'
+    global x, canvas                  # x is modified
+    canvas.create_line(x, y, x+10, y)
+    x += 10
+
+
+
+root = Tk()
+
+
+# canvas with border of size 100 x 150
+canvas = Canvas(root, height=100, width=150,
+                relief=SUNKEN, borderwidth=3)
+canvas.pack(side=LEFT)
+
+# frame to hold the 4 buttons
+box = Frame(root)
+box.pack(side=RIGHT)
+
+# the 4 button widgets have Frame widget box as their master
+button = Button(box, text='up', command=up)
+button.grid(row=0, column=0, columnspan=2)
+button = Button(box, text='left',command=left)
+button.grid(row=1, column=0)
+button = Button(box, text='right', command=right)
+button.grid(row=1, column=1)
+button = Button(box, text='down', command=down)
+button.grid(row=2, column=0, columnspan=2)
+
+x, y = 50, 75 # pen position, initially in the middle
+
+
+root.bind('<KeyPress-Up>', up)
+root.bind('<KeyPress-Down>', down)
+root.bind('<KeyPress-Left>', left)
+root.bind('<KeyPress-Right>', right)
+
+
+root.mainloop()
+

Chapter 9/Exercise9_14.py

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+from tkinter import Tk, Canvas, Frame, Button, SUNKEN, LEFT, RIGHT
+
+def move(dx, dy):
+    global x, y, canvas
+    canvas.create_line(x, y, x + dx, y + dy)
+    x += dx
+    y += dy
+
+root = Tk()
+
+# canvas with border of size 100 x 150
+canvas = Canvas(root, height=100, width=150,
+                relief=SUNKEN, borderwidth=3)
+canvas.pack(side=LEFT)
+
+# frame to hold the 4 buttons
+box = Frame(root)
+box.pack(side=RIGHT)
+
+# the 4 button widgets have Frame widget box as their master
+button = Button(box, text='up', command=lambda: move(0, -10))
+button.grid(row=0, column=0, columnspan=2)
+button = Button(box, text='left',command=lambda: move(-10, 0))
+button.grid(row=1, column=0)
+button = Button(box, text='right', command=lambda: move(10, 0))
+button.grid(row=1, column=1)
+button = Button(box, text='down', command=lambda: move(0, 10))
+button.grid(row=2, column=0, columnspan=2)
+
+x, y = 50, 75 # pen position, initially in the middle
+
+
+
+
+root.mainloop()
+

Chapter 9/Exercise9_15.py

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+from tkinter import Tk, Canvas, Frame, Button, SUNKEN, LEFT, RIGHT
+
+lastx = 0
+lasty = 0
+identity = 0
+
+# event handlers
+def up():
+    'move pen up 10 pixels'
+    global identity, y, canvas, lasty, lastx                  # y is modified
+    identity += 1
+    canvas.create_line(x, y, x, y-10, tags='last'+str(identity))
+    y -= 10
+    lasty = 10
+    lastx = 0
+
+def down():
+    'move pen down 10 pixels'
+    global identity, y, canvas, lasty, lastx                  # y is modified
+    identity += 1
+    canvas.create_line(x, y, x, y+10, tags='last'+str(identity))
+    y += 10
+    lastx = 0
+    lasty = -10
+
+def left():
+    'move pen left 10 pixels'
+    global identity, x, canvas, lastx, lasty                  # x is modified
+    identity += 1
+    canvas.create_line(x, y, x-10, y, tags='last'+str(identity))
+    x -= 10
+    lasty = 0
+    lastx = 10
+
+def right():
+    'move pen right 10 pixels'
+    global identity, x, canvas, lastx, lasty                  # x is modified
+    identity += 1
+    canvas.create_line(x, y, x+10, y, tags='last'+str(identity))
+    x += 10
+    lasty = 0
+    lastx = -10
+
+def clear():
+    global canvas
+    canvas.addtag_all(all)
+    canvas.delete(all)
+
+
+def delete():
+    global identity, canvas, x, y, lastx, lasty
+    canvas.delete('last'+str(identity))
+    x += lastx
+    y += lasty
+
+root = Tk()
+
+# canvas with border of size 100 x 150
+canvas = Canvas(root, height=100, width=150,
+                relief=SUNKEN, borderwidth=3)
+canvas.pack(side=LEFT)
+
+# frame to hold the 4 buttons
+box = Frame(root)
+box.pack(side=RIGHT)
+
+# the 4 button widgets have Frame widget box as their master
+button = Button(box, text='up', command=up)
+button.grid(row=0, column=0, columnspan=2)
+button = Button(box, text='left',command=left)
+button.grid(row=1, column=0)
+button = Button(box, text='right', command=right)
+button.grid(row=1, column=1)
+button = Button(box, text='down', command=down)
+button.grid(row=2, column=0, columnspan=2)
+button = Button(box, text='clear', command=clear)
+button.grid(row=3, column=0)
+button = Button(box, text='delete', command=delete)
+button.grid(row=3, column=1)
+
+x, y = 50, 75 # pen position, initially in the middle
+
+
+root.mainloop()
+

Chapter 9/Problem9_16.py

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+from tkinter import *
+from tkinter.messagebox import showinfo
+
+def bmi():
+    global height, weight
+    
+    altura = float(height.get())
+    peso = float(weight.get())
+    height.delete(0, 4)
+    weight.delete(0, 4)
+    bmi = peso/altura**2
+    message = 'Your BMI is:{}'.format(bmi)
+    showinfo(message=message)
+
+
+
+root = Tk()
+
+frameup = Frame(root)
+frameup.grid(row=0)
+
+framebutton = Frame(root)
+framebutton.grid(row=1)
+
+labelheight = Label(frameup, text = 'Enter your height:')
+labelheight.grid(row=0, column=0)
+height = Entry(frameup)
+height.grid(row=0, column = 1)
+labelweight = Label(frameup, text = 'Enter your weight:')
+labelweight.grid(row = 1, column = 0)
+weight = Entry(frameup)
+weight.grid(row = 1, column = 1)
+
+buttoncompute = Button(framebutton, text = 'Compute BMI', command=bmi)
+buttoncompute.pack()
+
+root.mainloop()

Chapter 9/Problem9_17.py

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+from tkinter import *
+
+def calculatemortgage():
+    global entryloan, entryinterest, entryterm, entrymortgage
+    a = float(entryloan.get())
+    r = float(entryinterest.get())
+    t = float(entryterm.get())
+    c = r/1200
+    m = a*c*((1 + c)**t)/((1 + c)**t) -1
+    entrymortgage.delete(0, 10)
+    entrymortgage.insert(1, str(m))
+
+
+root = Tk()
+
+frameentry = Frame(root)
+frameentry.grid(row = 0)
+framebutton = Frame(root)
+framebutton.grid(row=1)
+
+labelloan = Label(frameentry, text='Loan amount:')
+labelloan.grid(row = 0, column = 0)
+entryloan = Entry(frameentry)
+entryloan.grid(row = 0, column = 1)
+labelinterest = Label(frameentry, text = 'Interest Rate:')
+labelinterest.grid(row = 1, column = 0)
+entryinterest = Entry(frameentry)
+entryinterest.grid(row = 1, column = 1)
+labelterm = Label(frameentry, text = 'Loan term:')
+labelterm.grid(row = 2, column = 0)
+entryterm = Entry(frameentry)
+entryterm.grid(row = 2, column = 1)
+labelmortgage = Label(frameentry, text = 'Mortgage')
+labelmortgage.grid(row = 3, column = 0)
+entrymortgage = Entry(frameentry)
+entrymortgage.grid(row = 3, column = 1)
+
+buttonmortgage = Button(framebutton, text = 'Compute Mortgage', command = calculatemortgage)
+buttonmortgage.pack()

Chapter 9/Problem9_18.py

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+#9.18 Develop a GUI that contains just one Frame widget of size 480 × 640 that has this
+#behavior: Every time the user clicks at some location in the frame, the location coordinates
+#are printed in the interactive shell.
+#>>>
+#you clicked at (55, 227)
+#you clicked at (426, 600)
+#you clicked at (416, 208)
+
+def click(event):
+    print('you clicked at ({},{})'.format(event.x, event.y))
+
+from tkinter import *
+
+root = Tk()
+
+frame = Frame(root, height = 480, width = 640)
+frame.pack()
+frame.bind('<Button>', click)
+
+root.mainloop()

Chapter 9/Problem9_19.py

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+from tkinter import *
+
+def imprint(text):
+    global entrynumber
+
+    entrynumber.insert(len(entrynumber.get()), text)
+
+    if len(entrynumber.get()) == 3:
+        entrynumber.insert(3, '-')
+    elif len(entrynumber.get()) == 7:
+        entrynumber.insert(7, '-')
+
+root = Tk()
+
+framedisplay = Frame(root)
+framedisplay.pack(side=TOP)
+framedigits = Frame(root)
+framedigits.pack(side=BOTTOM)
+
+entrynumber = Entry(framedisplay)
+entrynumber.pack()
+
+labels = [['1', '2', '3'],     # phone dial label texts
+          ['4', '5', '6'],     # organized in a grid
+          ['7', '8', '9'],
+          ['*', '0', '#']]
+
+
+for r in range(4):      # for every row r = 0, 1, 2, 3
+    for c in range(3):      # for every row c = 0, 1, 2
+        # create label for row r and column c
+        button = Button(framedigits,
+                      relief=RAISED,      # raised border
+                      padx=10,            # make label wide
+                      text=labels[r][c],  # label text  
+                      command=lambda text=labels[r][c]:imprint(text))
+        
+        # place label in row r and column c
+        button.grid(row=r, column=c)
+
+root.mainloop()