Python Gotchas and Rules

When is an empty list default argument created?

• On import
• At definition
• Never
• Each call

Calling add_item(1) then add_item(2) returns [1, 2] on the second call.

• True
• False

To avoid the mutable default trap, use ____ as the default value.

• {}
• None
• []
• 0

The mutable default problem applies to strings and tuples too.

• True
• False

What does [10, 20, 30, 40][1:3] return?

• [20, 30]
• [30, 40]
• [20, 30, 40]
• [10, 20]

What does [10, 20, 30, 40][-1] give?

• 30
• 10
• -1
• 40

The slice ____ returns a list in reverse order.

• [::2]
• [::-1]
• [1:3]
• [:-1]

Slicing modifies the original list in place.

• True
• False

An out-of-range slice raises an error in Python.

• True
• False

Which value is NOT falsy in Python?

• ""
• 0
• "hi"
• []

The operators and/or return one of their ____ rather than a strict boolean.

• operands
• errors
• indices
• types

What does the LEGB rule stand for?

• Local Extern Global Base
• List Enum Global Byte
• Level Enclosing Group Block
• Local Enclosing Global Built-in

To assign to a global variable inside a function, use the ____ keyword.

• extern
• static
• global
• nonlocal

Which keyword modifies an enclosing function's variable?

• local
• enclose
• global
• nonlocal

Assigning inside a function without 'global' changes the outer variable.

• True
• False