Python Python 5

Question 1

What does the `global` keyword do inside a Python function?

Accepted Answer

Declares that a variable name refers to the module-level global variable

Answer

`global x` inside a function tells Python to use and potentially modify the `x` defined at the module level rather than creating a local one.

Question 2

Which built-in function applies a function to every item in an iterable and returns a map object?

Accepted Answer

map()

Answer

`map(func, iterable)` applies `func` to each element and returns an iterator of the results.

Question 3

What is the output of `type(3.0)` in Python?

Accepted Answer

Answer

`3.0` is a floating-point literal, so `type(3.0)` returns `<class 'float'>`.

Question 4

What does `'%s has %d items' % ('cart', 5)` produce?

Accepted Answer

'cart has 5 items'

Answer

The `%` formatting operator substitutes `%s` with the string and `%d` with the integer from the tuple.

Question 5

Which Python data structure guarantees FIFO (first-in, first-out) ordering?

Accepted Answer

collections.deque used as a queue

Answer

`collections.deque` with `append()` and `popleft()` provides O(1) FIFO queue operations.

Python Practice Test