Python Built-in Functions MCQs – Multiple Choice Questions for Practice and Learning

iterator

`map()` in Python 3 returns a map object which is an iterator.

iterator

`filter()` returns a filter object which is an iterator.

[(1,3), (2,4)]

`zip()` pairs items from both lists by index into tuples.

map

The object is of type `map`, which is an iterator."

[('a','1'), ('b','2'), ('c','3')]

Each character of the strings is paired by index."

[1,2,3]

The `int` constructor is applied to each string in the list."

The number of characters in the string

`len()` returns the total count of characters in the string.

type

`type()` returns the type of the given object, which itself is an instance of `type`.

str()

`str()` returns a readable string version of an object, often more user-friendly than `repr()`.

list

`sorted()` always returns a new list containing the sorted elements.

False

`any()` returns `True` if at least one element is truthy; otherwise, it returns `False`.

ord()

`ord('A')` returns `65`, the Unicode code point for 'A'.

min()

`min()` returns the smallest element from the iterable.

bin()

`bin(5)` returns `'0b101'`.

map(lambda x: x**2, [1,2,3])

The correct syntax is `map(function, iterable)`; here the function is `lambda x: x**2`.

filter(lambda x: x%2==0, [1,2,3,4])

The lambda returns `True` for even numbers; `filter()` keeps only those values."

list(zip(*matrix))

Unpacking with `*` allows `zip()` to transpose rows into columns."

bool

`filter(bool, iterable)` keeps only truthy values.

list(zip([1,2,3], [4,5]))

`zip()` stops at the shortest iterable, here `[4,5]`.

lambda

A lambda function can wrap multiple function calls and be passed to `map()`."

filter(lambda w: len(w)>3, ['a','word','python'])

The lambda correctly checks length and `filter()` applies it to each element."

map() transforms, filter() selects

`map()` applies a function to every element, while `filter()` only keeps those that satisfy a condition.

[6,7,8,9]

The filter keeps only numbers greater than 5 from the range 0–9."

max()

`max()` returns the largest item from an iterable based on natural ordering or a provided key.

list()

`list('abc')` results in `['a', 'b', 'c']`.

abs()

`abs()` returns the absolute value of integers, floats, or complex numbers.

zip()

`zip()` pairs items from multiple iterables into tuples until the shortest iterable is exhausted.

map()

`map()` applies the given function to every item in the iterable and returns an iterator.

iterator of tuples

`enumerate()` returns an iterator of `(index, element)` tuples.

isinstance()

`isinstance(obj, Class)` checks whether `obj` is an instance of `Class` or its subclasses.

sum()

`sum()` returns the arithmetic sum of all numeric elements in an iterable.

Stops at the shortest iterable

`map()` stops when the shortest iterable is exhausted.

[1, 2, 'hello']

`filter(None, iterable)` removes all falsy values like `0` and `''`.

['A','B']

`map(str.upper, iterable)` applies `str.upper` method to each string.

[5,7,9]

`map()` stops at the shortest iterable, producing three results.

It returns an iterator of tuples

`zip()` produces an iterator of tuples and works with any number of iterables.

iterator

In Python 3, `zip()` returns an iterator of tuples, unlike Python 2 which returned a list.

exec()

`exec()` executes dynamic Python code, while `eval()` only evaluates expressions.

xrange()

`xrange()` was available in Python 2 but not in Python 3; `range()` in Python 3 behaves like `xrange()`.

id()

`id()` returns the unique identity of an object, which is its memory address in CPython.