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Python - Conditions

What are Conditions?

Conditions in Python (also called conditional statements) allow us to execute code only if certain criteria are met. They are implemented using keywords like if, elif, and else.

Why Use Conditions?

  • To make ecisions during program execution.
  • To control the flow of code based on logic.
  • To handle different scenarios and inputs dynamically.

How to Use Conditions in Python?

1. Basic if Statement

python
x = 10 if x > 5: print("x is greater than 5")

2. Using if-else

python
x = 3 if x > 5: print("x is greater than 5") else: print("x is not greater than 5")

3. Using if-elif-else

python
x = 5 if x > 5: print("x is greater than 5") elif x == 5: print("x is equal to 5") else: print("x is less than 5")

4. Nested Conditions

python
x = 7 if x > 5: if x < 10: print("x is between 6 and 9")

When to Use Conditions?

  • When you want your code to behave differently under different inputs or states.
  • In form validations, menu-driven programs, access control logic, etc.
  • To branch logic based on flags, input, or error handling.

Pros

  • Simple and readable syntax.
  • Makes programs dynamic and interactive.
  • Essential for any decision-making process in software.

Cons

  • Too many nested conditions can reduce readability.
  • Complex logic may require better structuring (e.g., with functions).

Best Practices

  • Keep conditions readable and simple.
  • Use logical operators (and, or, not) wisely.
  • Avoid deep nesting – consider functions or early returns.