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Measure the Elapsed Time in Python Represent enum Create a Countdown Timer Convert Bytes to a String

Introduction

Print Hello world!Add Two Numbers Find the Square Root Calculate the Area of a Triangle Solve Quadratic Equation Swap Two Variables Generate a Random Number Convert Kilometers to Miles Convert Celsius To Fahrenheit Print Output Without a Newline

Object Oriented

Get the Class Name of an Instance Differentiate Between type() and isinstance()

Decision Making and Loops

Check if a Number is Positive, Negative or 0 Check if a Number is Odd or Even Check Leap Year Find the Largest Among Three Numbers Check Prime Number Print all Prime Numbers in an Interval Find the Factorial of a Number Display the multiplication Table Print the Fibonacci sequence Check Armstrong Number Find Armstrong Number in an Interval Find the Sum of Natural Numbers Create Pyramid Patterns Iterate Over Dictionaries Using for Loop Reverse a Number Compute the Power of a Number

Functions

Display Powers of 2 Using Anonymous Function Find Numbers Divisible by Another Number Convert Decimal to Binary, Octal and Hexadecimal Find ASCII Value of Character Find HCF or GCD Find LCM Find the Factors of a Number Make a Simple Calculator Shuffle Deck of Cards Display Calendar Display Fibonacci Sequence Using Recursion Find Sum of Natural Numbers Using Recursion Find Factorial of Number Using Recursion Convert Decimal to Binary Using Recursion Return Multiple Values From a Function

Native Datatypes

Add Two Matrices Transpose a Matrix Multiply Two Matrices Check Whether a String is Palindrome or Not Remove Punctuations From a String Sort Words in Alphabetic Order Illustrate Different Set Operations Count the Number of Each Vowel Merge Two Dictionaries Access Index of a List Using for Loop Flatten a Nested List Slice Lists Sort a Dictionary by Value Check If a List is Empty Concatenate Two Lists Check if a Key is Already Present in a Dictionary Split a List Into Evenly Sized Chunks Parse a String to a Float or Int Print Colored Text to the Terminal Convert String to Datetime Get the Last Element of the List Get a Substring of a String Randomly Select an Element From the List Check If a String Is a Number (Float)Count the Occurrence of an Item in a List Delete an Element From a Dictionary Create a Long Multiline String Convert Two Lists Into a Dictionary Trim Whitespace From a String Iterate Through Two Lists in Parallel Count the Number of Digits Present In a Number Check If Two Strings are Anagram Capitalize the First Character of a String Compute all the Permutation of the String Count the Number of Occurrence of a Character in String Remove Duplicate Element From a List

Files

Merge Mails Find the Size (Resolution) of an Image Find Hash of File Safely Create a Nested Directory Catch Multiple Exceptions in One Line Copy a File Python Program Read a File Line by Line Into a List Append to a File Extract Extension From the File Name Get the File Name From the File Path Get Line Count of a File Find All File with .txt Extension Present Inside a Directory Get File Creation and Modification Date Get the Full Path of the Current Working Directory Check the File Size

Python Program to Make a Simple Calculator

To understand this example, you should have the knowledge of the following Python programming topics:

Example: Simple Calculator by Using Functions


              
# This function adds two numbers
def add(x, y):
    return x + y

# This function subtracts two numbers
def subtract(x, y):
    return x - y

# This function multiplies two numbers
def multiply(x, y):
    return x * y

# This function divides two numbers
def divide(x, y):
    return x / y

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

while True:
    # take input from the user
    choice = input("Enter choice(1/2/3/4): ")

    # check if choice is one of the four options
    if choice in ('1', '2', '3', '4'):
        try:
            num1 = float(input("Enter first number: "))
            num2 = float(input("Enter second number: "))
        except ValueError:
            print("Invalid input. Please enter a number.")
            continue

        if choice == '1':
            print(num1, "+", num2, "=", add(num1, num2))

        elif choice == '2':
            print(num1, "-", num2, "=", subtract(num1, num2))

        elif choice == '3':
            print(num1, "*", num2, "=", multiply(num1, num2))

        elif choice == '4':
            print(num1, "/", num2, "=", divide(num1, num2))

        # check if user wants another calculation
        # break the while loop if answer is no
        next_calculation = input("Let's do next calculation? (yes/no): ")
        if next_calculation == "no":
          break
    else:
        print("Invalid Input")

Output


              
Select operation.
1.Add
2.Subtract
3.Multiply
4.Divide
Enter choice(1/2/3/4): 3
Enter first number: 15
Enter second number: 14
15.0 * 14.0 = 210.0
Let's do next calculation? (yes/no): no

In this program, we ask the user to choose an operation. Options 1, 2, 3, and 4 are valid. If any other input is given, Invalid Input is displayed and the loop continues until a valid option is selected.

Two numbers are taken and an if...elif...else branching is used to execute a particular section. User-defined functions add(), subtract(), multiply() and divide() evaluate respective operations and display the output.

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