Args in Python (*args)

Definition

The *args syntax in Python is used in a function definition to accept an arbitrary number of positional arguments, which are collected into a tuple.

Why It Matters

Using *args makes functions highly reusable and flexible, allowing them to handle inputs of variable length without requiring the caller to package them into a list or tuple beforehand.

Core Concepts

• Syntax: The asterisk (*) is the actual operator that performs the packing/unpacking; the name args is a strong community convention.

def sum_all(*args):
    return sum(args)

# Calling with arbitrary number of arguments
print(sum_all(1, 2, 3, 4)) # Output: 10

• Data Type: Inside the function, the parameter prefixed with * is treated as a tuple.
• Unpacking: The asterisk can also be used in function calls to unpack an existing tuple or list into separate positional arguments.

Connected Concepts

• Kwargs in Python (**kwargs)
• Arguments (Python)
• Parameters (Python)
• Functions (Python)
• Tuples (Python)
• Scale