Build GUI Calculator using Python (Source Code @ Description) | Beginner Tutorial | Python World
This Video is a Step-by-Step analysis on how to build a GUI Calculator Using Python.
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Source Code
from tkinter import *
def iCalc(source, side):
storeObj = Frame(source, borderwidth=4, bd=4, bg="powder blue")
storeObj.pack(side=side, expand =YES, fill =BOTH)
return storeObj
def button(source, side, text, command=None):
storeObj = Button(source, text=text, command=command)
storeObj.pack(side=side, expand = YES, fill=BOTH)
return storeObj
class app(Frame):
def __init__(self):
Frame.__init__(self)
self.option_add('*Font', 'arial 20 bold')
self.pack(expand = YES, fill =BOTH)
self.master.title('Calculator')
display = StringVar()
Entry(self, relief=RIDGE, textvariable=display,
justify='right'
, bd=30, bg="powder blue").pack(side=TOP,
expand=YES, fill=BOTH)
for clearButton in (["C"]):
erase = iCalc(self, TOP)
for ichar in clearButton:
button(erase, LEFT, ichar, lambda
storeObj=display, q=ichar: storeObj.set(''))
for numButton in ("789/", "456*", "123-", "0.+"):
FunctionNum = iCalc(self, TOP)
for iEquals in numButton:
button(FunctionNum, LEFT, iEquals, lambda
storeObj=display, q=iEquals: storeObj
.set(storeObj.get() + q))
EqualButton = iCalc(self, TOP)
for iEquals in "=":
if iEquals == '=':
btniEquals = button(EqualButton, LEFT, iEquals)
btniEquals.bind('(angled brackets)ButtonRelease-1(angled brackets)', lambda e,s=self,
storeObj=display: s.calc(storeObj), '+')
else:
btniEquals = button(EqualButton, LEFT, iEquals,
lambda storeObj=display, s=' %s ' % iEquals: storeObj.set
(storeObj.get() + s))
def calc(self, display):
try:
display.set(eval(display.get()))
except:
display.set("ERROR")
if __name__=='__main__':
app().mainloop()
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