๐ What are Positional Arguments?
Positional arguments are arguments passed to a function based on their order or position. The function expects these arguments in a specific sequence. If you change the order, you might get unexpected results or errors.
- ๐ Definition: Arguments passed based on their position in the function call.
- ๐ข Example: In `def greet(name, greeting):`, `name` is the first positional argument, and `greeting` is the second. So, `greet("Alice", "Hello")` assigns "Alice" to `name` and "Hello" to `greeting`.
- โ ๏ธ Order Matters: Changing the order, like `greet("Hello", "Alice")`, would greet "Hello" as the name.
๐ What are Keyword Arguments?
Keyword arguments are passed to a function using the name of the parameter as a keyword. This allows you to pass arguments in any order because the function knows which value belongs to which parameter. They enhance code readability.
- ๐ท๏ธ Definition: Arguments passed with a keyword indicating which parameter they correspond to.
- โจ Example: In `def describe_pet(animal_type, pet_name):`, you can call the function using keyword arguments like `describe_pet(animal_type="hamster", pet_name="Harry")`.
- ๐ Order Doesn't Matter: The order can be changed: `describe_pet(pet_name="Harry", animal_type="hamster")` and the result will be the same.
๐ Positional vs. Keyword Arguments: A Side-by-Side Comparison
| Feature |
Positional Arguments |
Keyword Arguments |
| Order |
Order matters |
Order doesn't matter |
| How to Pass |
Passed based on position |
Passed with parameter name as keyword |
| Readability |
Less readable if many arguments |
More readable, especially with many arguments |
| Flexibility |
Less flexible |
More flexible |
| Example |
my_func(a, b) |
my_func(b=2, a=1) |
๐ก Key Takeaways
- โ
Positional arguments rely on order, while keyword arguments use parameter names.
- ๐ Keyword arguments improve readability and flexibility.
- โ๏ธ You can combine both, but positional arguments must come first.
- ๐จ If you define a function with default parameter values, those can be skipped when calling the function. For example, in
def power(base, exponent=2): return base**exponent, you can call the function as power(3), which is the same as power(3, exponent=2).