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add calculator app tutorial
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‎README.md‎

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@@ -214,5 +214,6 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
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- [How to Make a Button using PyGame in Python](https://www.thepythoncode.com/article/make-a-button-using-pygame-in-python). ([code](gui-programming/button-in-pygame))
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- [How to Make a Drawing Program in Python](https://www.thepythoncode.com/article/make-a-drawing-program-with-python). ([code](gui-programming/drawing-tool-in-pygame))
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- [How to Make a File Explorer using Tkinter in Python](https://www.thepythoncode.com/article/create-a-simple-file-explorer-using-tkinter-in-python). ([code](gui-programming/file-explorer))
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- [How to Make a Calculator with Tkinter in Python](https://www.thepythoncode.com/article/make-a-calculator-app-using-tkinter-in-python). ([code](gui-programming/calculator-app))
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For any feedback, please consider pulling requests.

‎gui-programming/calculator-app/README.md‎

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# [How to Make a Calculator with Tkinter in Python](https://www.thepythoncode.com/article/make-a-calculator-app-using-tkinter-in-python)
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You can get the original version of the calculator [here](https://github.com/Maximinodotpy/calculator).

‎gui-programming/calculator-app/calculator.py‎

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from tkinter import *
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import tkinter.font as font
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from functools import partial
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import ctypes
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import json
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import re
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# so the functions can be used from the math module can be used in the lineedit.
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import math
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ctypes.windll.shcore.SetProcessDpiAwareness(1)
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# Colors
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buttonColor = (255, 255, 255)
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historyPanelBackground = (255, 255, 255)
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# Tkinter Setup
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root = Tk()
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root.geometry("550x270")
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root.title("Calculator")
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# Setting icon for the Application
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photo = PhotoImage(file = "icon.png")
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root.iconphoto(False, photo)
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# Loading Font from font name
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myFont = font.Font(family='Consolas', size=12)
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# Formula Templates
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formulas = [
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['Pythagoras->c', '(({a}**2)+({b}**2))**0.5 ? a=5 & b=5'],
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['Pythagoras->c**2', '({a}**2)+({b}**2) ? a=5 & b=5'],
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['pq->(x1, x2)', '-({p}/2) + sqrt(({p}/2)**2 - ({q})), -({p}/2) - sqrt(({p}/2)**2 - ({q})) ? p=-1 & q=-12'],
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['abc->(x1, x2)', 'quadratic_formula({a}, {b}, {c}) ? a=1 & b=5 & c=6'],
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['Incline->y', '{m}*{x} + {q} ? m=4 & x=5 & q=6'],
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]
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# All the history equations are in this list.
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history = []
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# Where the history file is located.
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historyFilePath = 'history.json'
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print("Reading history from:", historyFilePath)
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# Creating History file if it does not exist.
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try:
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with open(historyFilePath, 'x') as fp:
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pass
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print("Created file at:", historyFilePath)
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except:
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print('File already exists')
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# converting RGB values to HEX
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def rgb_to_hex(rgb):
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return "#%02x%02x%02x" % rgb
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# Add something to the current calculation
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def addSymbol(event=None, symbol=None):
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if symbol == '<':
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entryVariable.set(entryVariable.get()[:-1])
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else:
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entryVariable.set(entryVariable.get()+symbol)
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def varChange(*args):
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evaluationString = entryVariable.get().replace(' ', '').split('?')[0]
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print('Before insertion: ',evaluationString)
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if len(entryVariable.get().split('?')) == 2:
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parameters = entryVariable.get().replace(' ', '').split('?')[1]
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for param in parameters.split('&'):
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where, what = param.split('=')
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evaluationString = re.sub('{'+where+'}', what, evaluationString)
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try:
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print('After insertion: ', evaluationString)
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resultLabel.config(text=str(eval(evaluationString)))
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except:
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resultLabel.config(text='Invalid Input')
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def saveCurrentInputToHistory(event=None):
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if entryVariable.get() in history:
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return
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history.append(entryVariable.get())
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with open(historyFilePath, 'w') as file:
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file.write(json.dumps(history))
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updateListBox()
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def updateListBox(event=None):
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global history
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historyList.delete(0, END)
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try:
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with open(historyFilePath, 'r') as file:
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history = json.loads(file.read())
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except json.decoder.JSONDecodeError:
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print('File does not contain JSON')
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for index, item in enumerate(history):
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historyList.insert(index, item)
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def setEntryFromHistory(event=None):
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historyItem = historyList.get(historyList.curselection()[0])
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entryVariable.set(historyItem)
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def addFormula(formula=''):
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saveCurrentInputToHistory()
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entryVariable.set(formula)
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def quadratic_formula(a, b, c):
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disc = b**2 - 4 * a * c
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x1 = (-b - math.sqrt(disc)) / (2 * a)
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x2 = (-b + math.sqrt(disc)) / (2 * a)
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return(x1, x2)
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# Work with Frames to split the window in two parts: the calculator and the History Panel.
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# Calculation Panel
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calcSide = Frame(root)
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calcSide.pack(side=LEFT, fill=BOTH, expand=1)
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# Entry Variable for the calculations
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entryVariable = StringVar(root, '4/2**2')
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entryVariable.trace('w', varChange)
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Entry(calcSide, textvariable=entryVariable, font=myFont, borderwidth=0).pack(fill=X, ipady=10, ipadx=10)
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resultLabel = Label(calcSide, text='Result', font=myFont, borderwidth=0,anchor="e")
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resultLabel.pack(fill=X, ipady=10)
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# History Panel
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historySide = Frame(root, bg=rgb_to_hex(historyPanelBackground))
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historySide.pack(side=LEFT, fill=BOTH, expand=1)
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historyTopBar = Frame(historySide)
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historyTopBar.pack(fill=X)
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Label(historyTopBar, text='History').pack(side=LEFT)
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Button(historyTopBar, text='Save Current Input', bg=rgb_to_hex(buttonColor), borderwidth=0, command=saveCurrentInputToHistory).pack(side=RIGHT)
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historyList = Listbox(historySide, borderwidth=0)
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historyList.pack(fill=BOTH, expand=True)
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historyList.bind("<Double-Button-1>", setEntryFromHistory)
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# Insert stuff into the history
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updateListBox()
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# Button Symbols (and their position)
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symbols = [
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['1', '2', '3', '+'],
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['4', '5', '6', '-'],
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['7', '8', '9', '/'],
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['0', '.', '<', '*'],
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]
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for rowList in symbols:
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# Make a row
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row = Frame(calcSide)
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row.pack(fill=BOTH, expand=True)
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for symbol in rowList:
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# Making and packing the Button
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Button(
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row, text=symbol, command=partial(addSymbol, symbol=symbol),
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font=myFont, bg=rgb_to_hex(buttonColor), borderwidth=0) \
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.pack(side=LEFT, fill=BOTH, expand=1)
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# Change button color each iteration for gradient.
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buttonColor = (buttonColor[0] - 10, buttonColor[1] - 10, buttonColor[1] - 2)
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menubar = Menu(root)
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filemenu = Menu(menubar, tearoff=0)
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# Add all Formulas to the dropdown menu.
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for formula in formulas:
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filemenu.add_command(label=formula[0], command=partial(addFormula, formula[1]))
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filemenu.add_separator()
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# Quit command
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filemenu.add_command(label="Exit", command=root.quit)
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menubar.add_cascade(menu=filemenu, label='Formulas')
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root.config(menu=menubar)
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# Call the var change once so it is evaluated withhout actual change.
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varChange('foo')
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root.mainloop()

‎gui-programming/calculator-app/history.json‎

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["4/2**2", "4/2**3", "{a} ? a = 6", "", "-({p}/2) + sqrt( ({p}/2) - {q}) ? p=10 & q=5", "0", "({a}**2)+({b}**2) ? a=5 & b=5", "2+3/2*2-4", "(({a}**2)+({b}**2))**0.5 ? a=1 & b=7", "quadratic_formula({a}, {b}, {c}) ? a=1 & b=5 & c=6", "2-1/8*55", " {a} + 1 ? a=14"]

‎gui-programming/calculator-app/icon.png‎

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