Quick Check: Python Lambda Expressions

Check your understanding of lambda syntax, function objects, scope, and when to use def.

5 questions ~5 min

Knowledge check

Check your understanding of lambda syntax, function objects, scope, and when to use def.

You can retake this quiz whenever you like.

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What does lambda x: x * 2 produce?

A lambda expression produces a function object.
What is a Python lambda body restricted to?

Python lambda expressions are syntactically restricted to a single expression.
Which call uses a lambda as a sorting key?

list.sort() accepts a key function, and a lambda can provide that function inline.
Can a lambda refer to a name from its containing scope?

Like a nested function, a lambda can reference names from its containing scope.
When is def generally the clearer choice?

Use def when a function needs a meaningful name, multiple statements, or annotations.

Back to lesson Next: Python Decorators

What does lambda x: x * 2 produce?