SIMPLE CALCULATOR WITH TURTLE GRAPHICS IN PYTHON

He Guys, welcome to my new post. In field of Information Technology programming is very required and to do cybersecurity tasks you need to be skilled in one of the programming languages like python, java etc. Likewise, we have to learn python we also have to implement those skills in real world with some project.  Indentation error may occur while copying code or in desktop or moblie view mode so check this also while reading comments. The source code of simple python calculator with instructions in turtle graphics is given below:

SOURCE CODE

'''Importing turtle module for advanced use and advanced features like  exceptional handling etc. modified by me(Mahad).''' 

import turtle

# Making circle in grey color with white background

turtle.dot(550,"gray")

turtle.showturtle()

turtle.goto(-180,0)

turtle.pencolor("white")

turtle.pensize(10)

turtle.penup()

# Writing instructions

turtle.write("Welcome to our calculator\n\nInstructions to use simple calculator:\n1. Please enter user name\n2. Please enter first number \

\n3. Please enter second number\n\

4. Choose appropriate operation to add,multiply,subtract etc from instructions \

payment\n5. Get your desired result\n6. Enter 'Y' to use again or any other key to exit\nNote:\n1. You have to enter numbers only otherwise it will show invalid input.\n2. It will give Math error if any number divisible by 0 \nThanks for using our system\n\nA simple calculator programmed by M.Mahad Rasool")

# Hiding turtle sign for making more stylish theme

turtle.hideturtle()

# Writing welcome function to welcome user

def welcome():

    print("-------Welcome to our online calculation system----------")

    # Using strip() function to remove whitespace characters 

    name = input("Please enter your name: ").strip()  

    print("Hello",name,"\nLet's use calculator")

# Calling welcome() function to print welcome statement

welcome() 

# Importing math function to use in calculaton

import math 

import time

# Instructions for user to know about calculator operations

print("\nPlease choose math operation you want from below operations:\n\

'+' for add \n'-' for substraction\n\

'/' for division\n'*' for multiplication\n'^' for finding \

power of first number with second number as power\n'log' to find logarithm of both functions\n'sin' for finding sin of both numbers\n\

'cos' for finding sin of both numbers\n'tan' for finding sin of both numbers")

# Writng main function for which the calculator operation depends

def calculation(number1,number2):

    # Ask user to enter add,substraction or other function by            #choosing symbols from instructions

    # Using strip() function to remove whitespace characters 

    function = input("Enter operation: ").strip()

    # Adding additional function  of 'Math Error' if any number is        #divided by 0

    if number2 == 0 and function == '/' :

        print("Math Error")

        improve()

    if function == '+':

        print(number1,'+',number2,'=')

        print(number1 + number2)

    elif function == '-':

        print(number1,'-',number2,'=')

        print(number1 - number2)

    elif function == '/':

        print(number1,'/',number2,'=')

        print(number1 / number2)

    elif function == '*':

        print(number1,'*',number2,'=')

        print(number1 * number2)

    elif function == '^':

        print(number1,'^',number2,'=')

        print(number1 ^ number2)

    elif function == 'log':

        print("log",number1,'=',math.log(number1))

        print("log",number2,'=',math.log(number2))

    elif function == "sin":

        print("sin",number1,'=',math.sin(number1))

        print("sin",number2,'=',math.sin(number2))

    elif function == 'cos':

        print("cos",number1,'=',math.cos(number1))

        print("cos",number2,'=',math.cos(number2))

    elif function == 'tan':

        print("tan",number1,'=',math.tan(number1))

        print("tan",number2,'=',math.tan(number2))

    else:

        print("Invalid input")

    # Calling improve function to choose for further use calculator     #or not

    improve() 

# Make improve() function to allow user to further use calculator or #not

# Note that make improve() function below main calculator function #because\

# we have to use main calculator function in it to run again.

def improve():

    print("\nPlease enter 'Y' for perform other functions or any other key to exit")

    # Making user choice upper case

    response = input("Enter your choice: ").upper()

    if response == 'Y':

        '''Taking input from user with different variable name. Note that first_name and first_name1 is different.

Taking input from other name is necessary to prevent from local and global variable names error'''

        try:

            first_number1 = eval(input("\nEnter your first number: "))

            second_number2 = eval(input("Enter your second number: ")) 

        except:

            print("Sorry, try again.Alphabets not allowed and number must not start with zero.\nInvalid input")

            improve()

        #Again calling main calculator function with different input           #variable

        calculation(first_number1,second_number2)

    else:

        print("Thanks for using our system")

        # importing 'sys' library to exit function.

        # It is better way to use sys.exit() function as exit() kills         #the function making it program not professional.

        import sys 

        # Exiting function here because user wants to quit calculator

        print("Program will terminate automatically after 5 seconds")

        time.sleep(5)

        sys.exit() 

# Taking input from user and applying test function 'try/except' to #check input is numbers or not

try:

    first_number = eval(input("\nEnter your first number: "))

    second_number = eval(input("Enter your second number: "))

except:

    print("Sorry, try again.Alphabets not allowed and number must not start with zero.\nInvalid input")

    # If not correct input calling improve function to let user to        #choose to use calculator again

    improve() 

# Calling the main calculator function when running first time

calculation(first_number,second_number)