Graphical calculator in python
Have you ever wondered how calculators actually works. This is a program of a graphical calculator written in python. It can be run using GUI. Some external library files are also needed to run this.
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| from tkinter import * | |
| from tkinter import messagebox | |
| calculator = Tk() | |
| calculator.title("CALCULATOR") | |
| calculator.resizable(0, 1)#remove or change this in order to get different screen sizes | |
| class Application(Frame): | |
| def __init__(self, master, *args, **kwargs): Frame.__init__(self, master, *args, **kwargs) | |
| self.createWidgets() | |
| def replaceText(self, text): | |
| self.display.delete(0, END) | |
| self.display.insert(0, text) | |
| def appendToDisplay(self, text): | |
| self.entryText = self.display.get() | |
| self.textLength = len(self.entryText) | |
| if self.entryText == "0": | |
| self.replaceText(text) | |
| else: | |
| self.display.insert(self.textLength, text) | |
| def calculateExpression(self):#python's calculate function | |
| self.expression = self.display.get() | |
| self.expression = self.expression.replace("%", "/ 100") | |
| try: | |
| self.result = eval(self.expression) | |
| self.replaceText(self.result) | |
| except: | |
| messagebox.showinfo("ERROR", "Invalid input", icon="warning", parent=calculator) | |
| def clearText(self):#clears imput on pressing C on Calculator | |
| self.replaceText("0") | |
| def createWidgets(self): | |
| self.display = Entry(self, font=("Helvetica", 16), borderwidth=0, relief=RAISED, justify=RIGHT) | |
| self.display.insert(0, "0") | |
| self.display.grid(row=0, column=0, columnspan=5) | |
| #This is the First Row | |
| self.sevenButton = Button(self, font=("Helvetica", 11), text="7", borderwidth=0, command=lambda: self.appendToDisplay("7")) | |
| self.sevenButton.grid(row=1, column=0, sticky="NWNESWSE") | |
| self.eightButton = Button(self, font=("Helvetica", 11), text="8", borderwidth=0, command=lambda: self.appendToDisplay("8")) | |
| self.eightButton.grid(row=1, column=1, sticky="NWNESWSE") | |
| self.nineButton = Button(self, font=("Helvetica", 11), text="9", borderwidth=0, command=lambda: self.appendToDisplay("9")) | |
| self.nineButton.grid(row=1, column=2, sticky="NWNESWSE") | |
| self.timesButton = Button(self, font=("Helvetica", 11), text="*", borderwidth=0, command=lambda: self.appendToDisplay("*")) | |
| self.timesButton.grid(row=1, column=3, sticky="NWNESWSE") | |
| self.clearButton = Button(self, font=("Helvetica", 11), text="C", borderwidth=0, command=lambda: self.clearText()) | |
| self.clearButton.grid(row=1, column=4, sticky="NWNESWSE") | |
| #This is the Second Row | |
| self.fourButton = Button(self, font=("Helvetica", 11), text="4", borderwidth=0, command=lambda: self.appendToDisplay("4")) | |
| self.fourButton.grid(row=2, column=0, sticky="NWNESWSE") | |
| self.fiveButton = Button(self, font=("Helvetica", 11), text="5", borderwidth=0, command=lambda: self.appendToDisplay("5")) | |
| self.fiveButton.grid(row=2, column=1, sticky="NWNESWSE") | |
| self.sixButton = Button(self, font=("Helvetica", 11), text="6", borderwidth=0, command=lambda: self.appendToDisplay("6")) | |
| self.sixButton.grid(row=2, column=2, sticky="NWNESWSE") | |
| self.divideButton = Button(self, font=("Helvetica", 11), text="/", borderwidth=0, command=lambda: self.appendToDisplay("/")) | |
| self.divideButton.grid(row=2, column=3, sticky="NWNESWSE") | |
| self.percentageButton = Button(self, font=("Helvetica", 11), text="%", borderwidth=0, command=lambda: self.appendToDisplay("%")) | |
| self.percentageButton.grid(row=2, column=4, sticky="NWNESWSE") | |
| #This is the Third Row | |
| self.oneButton = Button(self, font=("Helvetica", 11), text="1", borderwidth=0, command=lambda: self.appendToDisplay("1")) | |
| self.oneButton.grid(row=3, column=0, sticky="NWNESWSE") | |
| self.twoButton = Button(self, font=("Helvetica", 11), text="2", borderwidth=0, command=lambda: self.appendToDisplay("2")) | |
| self.twoButton.grid(row=3, column=1, sticky="NWNESWSE") | |
| self.threeButton = Button(self, font=("Helvetica", 11), text="3", borderwidth=0, command=lambda: self.appendToDisplay("3")) | |
| self.threeButton.grid(row=3, column=2, sticky="NWNESWSE") | |
| self.minusButton = Button(self, font=("Helvetica", 11), text="-", borderwidth=0, command=lambda: self.appendToDisplay("-")) | |
| self.minusButton.grid(row=3, column=3, sticky="NWNESWSE") | |
| self.equalsButton = Button(self, font=("Helvetica", 11), text="=", borderwidth=0, command=lambda: self.calculateExpression()) | |
| self.equalsButton.grid(row=3, column=4, sticky="NWNESWSE", rowspan=2) | |
| #This is the Fourth Row | |
| self.zeroButton = Button(self, font=("Helvetica", 11), text="0", borderwidth=0, command=lambda: self.appendToDisplay("0")) | |
| self.zeroButton.grid(row=4, column=0, columnspan=2, sticky="NWNESWSE") | |
| self.dotButton = Button(self, font=("Helvetica", 11), text=".", borderwidth=0, command=lambda: self.appendToDisplay(".")) | |
| self.dotButton.grid(row=4, column=2, sticky="NWNESWSE") | |
| self.plusButton = Button(self, font=("Helvetica", 11), text="+", borderwidth=0, command=lambda: self.appendToDisplay("+")) | |
| self.plusButton.grid(row=4, column=3, sticky="NWNESWSE") | |
| app = Application(calculator).grid() | |
| calculator.mainloop() |
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