Welcome folks today in this blog post we will be building a mini calculator in tkinter using python. All the full source code of the application will be given below.
Get Started
In order to get started make an app.py file and copy paste the following code
app.py
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# importing Tkinter and math from tkinter import * import math # calc class class calc: def getandreplace(self): """replace x with * and � with /""" self.expression = self.e.get() self.newtext=self.expression.replace('/','/') self.newtext=self.newtext.replace('x','*') def equals(self): """when the equal button is pressed""" self.getandreplace() try: # evaluate the expression using the eval function self.value= eval(self.newtext) except SyntaxError or NameError: self.e.delete(0,END) self.e.insert(0,'Invalid Input!') else: self.e.delete(0,END) self.e.insert(0,self.value) def squareroot(self): """squareroot method""" self.getandreplace() try: # evaluate the expression using the eval function self.value= eval(self.newtext) except SyntaxError or NameError: self.e.delete(0,END) self.e.insert(0,'Invalid Input!') else: self.sqrtval=math.sqrt(self.value) self.e.delete(0,END) self.e.insert(0,self.sqrtval) def square(self): """square method""" self.getandreplace() try: #evaluate the expression using the eval function self.value= eval(self.newtext) except SyntaxError or NameError: self.e.delete(0,END) self.e.insert(0,'Invalid Input!') else: self.sqval=math.pow(self.value,2) self.e.delete(0,END) self.e.insert(0,self.sqval) def clearall(self): """when clear button is pressed,clears the text input area""" self.e.delete(0,END) def clear1(self): self.txt=self.e.get()[:-1] self.e.delete(0,END) self.e.insert(0,self.txt) def action(self,argi): """pressed button's value is inserted into the end of the text area""" self.e.insert(END,argi) def __init__(self,master): """Constructor method""" master.title('Calulator') master.geometry() self.e = Entry(master) self.e.grid(row=0,column=0,columnspan=6,pady=3) self.e.focus_set() #Sets focus on the input text area # Generating Buttons Button(master,text="=",width=11,height=3,fg="blue", bg="orange",command=lambda:self.equals()).grid( row=4, column=4,columnspan=2) Button(master,text='AC',width=5,height=3, fg="red", bg="light green", command=lambda:self.clearall()).grid(row=1, column=4) Button(master,text='C',width=5,height=3, fg="red",bg="light green", command=lambda:self.clear1()).grid(row=1, column=5) Button(master,text="+",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action('+')).grid(row=4, column=3) Button(master,text="x",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action('x')).grid(row=2, column=3) Button(master,text="-",width=5,height=3, fg="red",bg="light green", command=lambda:self.action('-')).grid(row=3, column=3) Button(master,text="�",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action('/')).grid(row=1, column=3) Button(master,text="%",width=5,height=3, fg="red",bg="light green", command=lambda:self.action('%')).grid(row=4, column=2) Button(master,text="7",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action('7')).grid(row=1, column=0) Button(master,text="8",width=5,height=3, fg="red",bg="light green", command=lambda:self.action(8)).grid(row=1, column=1) Button(master,text="9",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action(9)).grid(row=1, column=2) Button(master,text="4",width=5,height=3, fg="red",bg="light green", command=lambda:self.action(4)).grid(row=2, column=0) Button(master,text="5",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action(5)).grid(row=2, column=1) Button(master,text="6",width=5,height=3, fg="white",bg="blue", command=lambda:self.action(6)).grid(row=2, column=2) Button(master,text="1",width=5,height=3, fg="red",bg="light green", command=lambda:self.action(1)).grid(row=3, column=0) Button(master,text="2",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action(2)).grid(row=3, column=1) Button(master,text="3",width=5,height=3, fg="white",bg="blue", command=lambda:self.action(3)).grid(row=3, column=2) Button(master,text="0",width=5,height=3, fg="white",bg="blue", command=lambda:self.action(0)).grid(row=4, column=0) Button(master,text=".",width=5,height=3, fg="red",bg="light green", command=lambda:self.action('.')).grid(row=4, column=1) Button(master,text="(",width=5,height=3, fg="white",bg="blue", command=lambda:self.action('(')).grid(row=2, column=4) Button(master,text=")",width=5,height=3, fg="blue",bg="orange", command=lambda:self.action(')')).grid(row=2, column=5) Button(master,text="?",width=5,height=3, fg="red",bg="light green", command=lambda:self.squareroot()).grid(row=3, column=4) Button(master,text="x�",width=5,height=3, fg="white",bg="blue", command=lambda:self.square()).grid(row=3, column=5) # Driver Code root = Tk() obj=calc(root) # object instantiated root.mainloop() |
Now if you execute the python script app.py by typing the below command as shown below
python app.py
