Python If-Else Conditions and Logic
Learn conditional statements in Python. Discover how to use if, elif, and else to control code flow and make decisions in your applications.
Overview
Conditional statements evaluate a Boolean expression (True or False) and execute code based on the result.
The "if" keyword is used to test a condition. If it is true, the indented block of code runs.
The "elif" (else if) and "else" keywords provide alternative paths if the preceding conditions are not met. Proper indentation is required in Python to define code blocks.
Code Example
Evaluating network status codes securely routing application logic flow context dependent upon the value.
status_code = 404
if status_code == 200:
print("Success: Page loaded!")
elif status_code == 404:
print("Error: Page not found.")
elif status_code == 500:
print("Error: Internal server error.")
else:
print(f"Unknown status code: {status_code}")Error: Page not found.Real-world Use Cases
- Validating user input forms
- Handling exceptions and specific error codes
- Routing users inside a web framework
Frequently Asked Questions
What is the "match-case" statement?
Python 3.10 introduced structural pattern matching. It works like a switch statement in other languages, offering a cleaner alternative to excessive elif chains.
Can I nest if statements?
Yes, you can place if statements inside other if statements, but remember to indent appropriately.