Summary - Function parameters
- Python course
- Beginner
- Lesson 82/116
- 5 min
Combine keyword and type hints to write a calculation function.
Summary - Function parameters
In this group we covered positional, keyword, keyword-only, positional-only and type hints.
- Positional: matches by order.
- Keyword: passed by name, order irrelevant.
- Keyword-only: separated by
*. - Positional-only: separated by
/. - Type hint: type annotation, not enforced.
Now two tasks combine these concepts.
Practice Type hint and keyword together
Define a function called greet with parameters name: str and greeting: str = "Hello", return type -> None. The body does print(greeting, name). Call it with the keyword call greet(name="Ayse").
Starter code
# Define the greet functionSample solution
def greet(name: str, greeting: str = "Hello") -> None:
print(greeting, name)
greet(name="Ayse")Expected output
Hello Ayse
Practice Keyword-only and type hint together
Define a function called create_user with name: str positional, then *, then role: str and active: bool keyword-only parameters, return type -> None. The body does print(name, role, active). Call it with create_user("Ayse", role="admin", active=True).
Starter code
# Define the create_user functionSample solution
def create_user(name: str, *, role: str, active: bool) -> None:
print(name, role, active)
create_user("Ayse", role="admin", active=True)Expected output
Ayse admin True
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 Which statement is correct?
- Type hints slow the code down
- Positional-only is separated by *
- Keyword depends on order
- Keyword-only is separated by * Correct answer
Explanation: Parameters after the star are keyword-only.
2 Complete the positional-only call
result = compute(____, 4)result = compute(3, 4)Explanation: compute(3, 4) is a positional call; a=3 cannot be used.