Python Programming Concepts: Arithmetic Operations, Selection Statements, Loops, Functions, Exception Handling

Study Notes

Python Programming Concepts

Arithmetic Operations

Arithmetic operators are used to perform mathematical operations such as addition, subtraction, multiplication, division, modulus, and exponentiation. Here's a summary of each arithmetic operator and its corresponding operation:

Operator	Operation
`+`	Addition
`-`	Subtraction
`*`	Multiplication
`/`	Division
`%`	Modulus (remainder)
`**`	Exponentiation

For instance, 2 ** 3 evaluates to 8, representing the result of raising 2 to the power of 3. Additionally, there exists a floor division operator denoted by //, which returns the largest integer less than or equal to the result of dividing num by denom.

Selection Statements

Selection statements in Python are used to evaluate conditions and execute certain actions accordingly. They include if, elif, and else statements. These statements are structured as follows:

if condition1:
    # code block if condition1 is true
elif condition2:
    # code block if condition1 is false and condition2 is true
else:
    # code block if none of the above conditions are true

An if statement tests whether a particular condition is true or false, and executes the code block associated with it accordingly. Similarly, an elif statement serves as a shorthand for "else if" and allows for multiple conditions to be checked sequentially. Finally, an else statement specifies a default action to take if none of the previous conditions are met.

Loops

Loops in Python enable repeating a set of instructions until a specified condition is fulfilled. There are two types of loops in Python: for and while.

for loop iterates over a collection (list, tuple, or string) and allows you to access each element in that collection.
while loop continuously executes a block of code as long as the specified condition is true.

Functions

Functions in Python are reusable pieces of code that encapsulate a specific task. They can accept input parameters and return output values. Functions are defined using the def keyword followed by the function name, followed by a colon, and finally the body of the function.

Here's an example of a simple Python function called add:

def add(x, y):
    sum = x + y
    return sum

Exception Handling

Exception handling is a mechanism used to handle runtime errors and exceptions in Python. Python includes built-in support for error handling with the try and except statements. The try block contains the code that might generate an exception, and the except block specifies the type of exception to catch and the code to run when that exception occurs.

For example, catching an IndexError exception could look like this:

try:
    # Some potentially risky code that raises IndexError
    my_list
except IndexError:
    # Error handling logic
    print("List index out of bounds")

In conclusion, these Python programming concepts form the foundation of developing robust applications and solving problems efficiently.

Description

Explore key Python programming concepts including arithmetic operations, selection statements, loops, functions, and exception handling. Learn about performing mathematical operations, evaluating conditions, repetitive tasks, defining reusable code blocks, and handling runtime errors in Python.

Python Programming Concepts: Arithmetic Operations, Selection Statements, Loops, Functions, Exception Handling

Choose a study mode

Podcast

Questions and Answers

What is the purpose of an 'else' statement in Python?

Which type of loop in Python iterates over a collection like a list, tuple, or string?

What is the purpose of a 'try' block in Python?

How does a 'while' loop in Python differ from a 'for' loop?

What keyword is used to define functions in Python?

In Python, how do you specify the type of exception to catch using exception handling?

What is the result of the expression `5 % 3`?

Which statement is used to check multiple conditions sequentially?

What is the output of the following code?

x = 10 if x > 5: print('x is greater than 5') else: print('x is less than or equal to 5')```

What is the result of the expression `2 3 2`?

What is the purpose of the `//` operator in Python?

What is the output of the following code?

x = 10 y = 5 if x > y: print('x is greater than y') elif x < y: print('x is less than y') else: print('x is equal to y')```

Study Notes