Why is it important to avoid code repetition in development and how is this achieved through the DRY principle?

Avoiding code repetition is important for improving software quality and maintainability. Repetitive code:

• Increases the likelihood of errors, as fixes need to be made in multiple places.
• Complicates logic changes, as code must be modified everywhere it is repeated.
• Makes understanding and testing more difficult.

The DRY (Don't Repeat Yourself) principle encourages writing code so that each piece of logic is implemented only once. This is achieved through:

• Using functions and methods for repetitive operations.
• Abstractions and classes to group similar behavior.
• Modules and libraries for code reuse.

Example:

# Bad (repetition):
print("Hello, Ivan")
print("Hello, Maria")

# Good (DRY):
def greet(name):
    print(f"Hello, {name}")

greet("Ivan")
greet("Maria")

This approach makes code maintenance and development easier.