Built-in Functions

Question 1

what does cmp() do?

Answer 1

cmp() is a n-built function in Python, it is used to compare two objects and returns value according to the given values. It does not return ‘true’ or ‘false’ instead of ‘true’ / ‘false’, it returns negative, zero or positive value based on the given input.

Syntax: cmp(obj1, obj2)

Here, cmp() will return negative (-1) if obj1obj2.

Question 2

What are the different outputs of cmp()?

Answer 2

Syntax: cmp(obj1, obj2)

Here, cmp() will return negative (-1) if obj1obj2.

Question 3

what does bit_length() do?

Answer 3

Return the number of bits necessary to represent an integer in binary, excluding the sign and leading zeros

Question 4

what would bit_length(37) return?

Answer 4

>>> n = -37
>>> bin(n)
'-0b100101'
>>> n.bit_length()
6

Question 5

what does enumerate() do?

Answer 5

enumerate(iterable, start=0)

Enumerate() method adds a counter to an iterable and returns it in a form of enumerate object. This enumerate object can then be used directly in for loops or be converted into a list of tuples using list() method.

Question 6

why is enumerate() helpful?

Answer 6

because it allows you to grab indexes and/or have a counter while going through an iterable.

Question 7

What is the map() function do?

Answer 7

map(fun, iter)

map() function returns a map object(which is an iterator) of the results after applying the given function to each item of a given iterable (list, tuple etc.)

Question 8

When should you use the map() function?

Answer 8

Whenever you want to get an output of a function being run on an iterable.

Question 9

What date function gives you a date object formatted with yyyy-mm-dd?

Answer 9

datetime.date.today()