What is wrong? Trying to make a simple calculator in Tkinter.

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What is wrong? Trying to make a simple calculator in Tkinter.

 
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  #1
Sep 25th, 2007
Python Syntax (Toggle Plain Text) 
  1. global Num1
  2. from Tkinter import *
  3. Num1 = ""
  4. def buttonNPush(n):
  5.     global Num1
  6.     Num1 = Num1+n
  7.     print Num1
  8. def clearScr():
  9.     global Num1
  10.     Num1 = ""
  11.  
  12. root = Tk()
  13. textbox = Entry(root)
  14. textbox.pack(side=TOP)
  15. #Create Frame with buttons numbered 0-9
  16. frameButtons = Frame(root)
  17. frameButtons.pack(side=LEFT)
  18. button1 = Button(frameButtons, text="1", command=buttonNPush("1"))
  19. button1.grid(row=0, column=0)
  20. button2 = Button(frameButtons, text="2", command=buttonNPush("2"))
  21. button2.grid(row=0, column=1)
  22. button3 = Button(frameButtons, text="3", command=buttonNPush("3"))
  23. button3.grid(row=0, column=2)
  24. button4 = Button(frameButtons, text="4", command=buttonNPush("4"))
  25. button4.grid(row=1, column=0)
  26. button5 = Button(frameButtons, text="5", command=buttonNPush("5"))
  27. button5.grid(row=1, column=1)
  28. button6 = Button(frameButtons, text="6", command=buttonNPush("6"))
  29. button6.grid(row=1, column=2)
  30. button7 = Button(frameButtons, text="7", command=buttonNPush("7"))
  31. button7.grid(row=2, column=0)
  32. button8 = Button(frameButtons, text="8", command=buttonNPush("8"))
  33. button8.grid(row=2, column=1)
  34. button9 = Button(frameButtons, text="9", command=buttonNPush("9"))
  35. button9.grid(row=2, column=2)
  36. button0 = Button(frameButtons, text="0", command=buttonNPush("0"))
  37. button0.grid(row=3, column=0)
  38. buttonClear = Button(frameButtons, text="C", command=clearScr)
  39. buttonClear.grid(row=4, column=0)
  40. root.mainloop()

It just prints:
Python Syntax (Toggle Plain Text) 
  1. 1
  2. 12
  3. 123
  4. 1234
  5. 12345
  6. 123456
  7. 1234567
  8. 12345678
  9. 123456789
  10. 1234567890

How do I make it wait until I press the buttons to add the numbers to the string. The buttons also don't run the event that they are meant to run.
I am just like Mandark. I am calm, constantly annoyed and consider everyone insects. And my laugh...

HAhahahaHAhahahahahaHAhahahaaaHAhahaahaa</mandark clone>
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Re: What is wrong? Trying to make a simple calculator in Tkinter.

 
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  #2
Sep 25th, 2007
You want to add buttons for the functions to add, multiply, etc and tie that to the proper event. Right now, every button you push calls buttonNPush which prints the button. You also have to issue a get() to retrieve data. See this link for an example.
http://www.uselesspython.com/calculator.py
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Re: What is wrong? Trying to make a simple calculator in Tkinter.

 
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  #3
Sep 27th, 2007
Two bad things stick out right away from your code:

1) Don't mix Tkinter geometry managers pack and grid within the same frame.

2) Command accepts a function reference not a function call. To pass an argument use lambda, a closure, or the new partial function (Python25).

Take a look at:
http://www.daniweb.com/code/snippet610.html

That snippet uses a lambda function to pass the argument (button value).
Last edited by vegaseat; Sep 27th, 2007 at 1:28 am. Reason: snippet
May 'the Google' be with you!
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Originally Posted by chris99 View Post
Python Syntax (Toggle Plain Text) 
  1. global Num1
  2. from Tkinter import *
  3. Num1 = ""
  4. def buttonNPush(n):
  5.     global Num1
  6.     Num1 = Num1+n
  7.     print Num1
  8. def clearScr():
  9.     global Num1
  10.     Num1 = ""
  11.  
  12. root = Tk()
  13. textbox = Entry(root)
  14. textbox.pack(side=TOP)
  15. #Create Frame with buttons numbered 0-9
  16. frameButtons = Frame(root)
  17. frameButtons.pack(side=LEFT)
  18. button1 = Button(frameButtons, text="1", command=buttonNPush("1"))
  19. button1.grid(row=0, column=0)
  20. button2 = Button(frameButtons, text="2", command=buttonNPush("2"))
  21. button2.grid(row=0, column=1)
  22. button3 = Button(frameButtons, text="3", command=buttonNPush("3"))
  23. button3.grid(row=0, column=2)
  24. button4 = Button(frameButtons, text="4", command=buttonNPush("4"))
  25. button4.grid(row=1, column=0)
  26. button5 = Button(frameButtons, text="5", command=buttonNPush("5"))
  27. button5.grid(row=1, column=1)
  28. button6 = Button(frameButtons, text="6", command=buttonNPush("6"))
  29. button6.grid(row=1, column=2)
  30. button7 = Button(frameButtons, text="7", command=buttonNPush("7"))
  31. button7.grid(row=2, column=0)
  32. button8 = Button(frameButtons, text="8", command=buttonNPush("8"))
  33. button8.grid(row=2, column=1)
  34. button9 = Button(frameButtons, text="9", command=buttonNPush("9"))
  35. button9.grid(row=2, column=2)
  36. button0 = Button(frameButtons, text="0", command=buttonNPush("0"))
  37. button0.grid(row=3, column=0)
  38. buttonClear = Button(frameButtons, text="C", command=clearScr)
  39. buttonClear.grid(row=4, column=0)
  40. root.mainloop()

It just prints:
Python Syntax (Toggle Plain Text) 
  1. 1
  2. 12
  3. 123
  4. 1234
  5. 12345
  6. 123456
  7. 1234567
  8. 12345678
  9. 123456789
  10. 1234567890

How do I make it wait until I press the buttons to add the numbers to the string. The buttons also don't run the event that they are meant to run.
from Tkinter import *

def frame(root, side):
w = Frame(root)
w.pack(side=side, expand=YES, fill=BOTH)
return w

def button(root, side, text, command=None):
w = Button(root, text=text, command=command)
w.pack(side=side, expand=YES, fill=BOTH)
return w

class Calculator(Frame):
def __init__(self):
Frame.__init__(self)
self.option_add('*Font', 'Verdana 12 bold')
self.pack(expand=YES, fill=BOTH)
self.master.title('Simple Calculator')
self.master.iconname("calc1")

display = StringVar()
Entry(self, relief=SUNKEN, textvariable=display).pack(side=TOP, expand=YES, fill=BOTH)

for key in ("123", "456", "789", "-0."):
keyF = frame(self, TOP)
for char in key:
button(keyF, LEFT, char,
lambda w=display, c=char: w.set(w.get() + c))

opsF = frame(self, TOP)
for char in "+-*/=":
if char == '=':
btn = button(opsF, LEFT, char)
btn.bind('<ButtonRelease-1>',
lambda e, s=self, w=display: s.calc(w), '+')
else:
btn = button(opsF, LEFT, char,
lambda w=display, s=' %s '%char: w.set(w.get()+s))

clearF = frame(self, BOTTOM)
button(clearF, LEFT, 'Clr', lambda w=display: w.set(''))

def calc(self, display):
try:
display.set(eval(display.get()))
except:
display.set("ERROR")

if __name__ == '__main__':
Calculator().mainloop()
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1 Day Ago
Please don't bump up an old thread that has already been solved. It is confusing for the rest of us. Start your own thread if you need help!
May 'the Google' be with you!
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