Python built-ins

Question 1

What does abs() do?

Answer 1

returns absolute if a complex number, it returns the magnitude. If x defined __abs__() it returns the result here.

Question 2

all(iterable)

Answer 2

returns if all elements in iterable are True

Question 3

ascii(object)

Answer 3

returns a string representing an object

Question 4

bin(x)

Answer 4

convert to binary with 0b prefixed

Question 5

bytearray([source[, encoding[, errors]]])

Answer 5

create an array of bytes

Question 6

bytearray([source[, encoding[, errors]]])

Answer 6

create an array of bytes

Question 7

bytes([source,[encoding,[errors]]])

Answer 7

creates byte object

Question 8

callable(object)

Answer 8

returns true if callable. Implements __callable__ or a class

Question 9

char(i)

Answer 9

returns the unicode char value

Question 10

@classmethod

Answer 10

decorator for a class method can be called on an instance

Question 11

compile(source, filename, mode, flags=0, dont_inherit=False, optimize=-1)¶

Answer 11

compiles to an ast

Question 12

complex([real,[image]])

Answer 12

returns a complex number

Question 13

delattr(object,name)

Answer 13

deletes an object attribute

Question 14

class dict(**kwarg)

Answer 14

builds a dictionary

Question 15

dir([object])

Answer 15

without arg returns a list of names in current scope, with arg returns list of valid attribute for an object

Question 16

divmod(a,b)

Answer 16

take two non complex numbers and returns division and remainder

Question 17

enumerate

Answer 17

iterable that returns a __next__ method that gives a tuple of index and value

Question 18

eval()

Answer 18

evaluates a string expression

Question 19

filter(function,iterable)

Answer 19

filters an iteable

Question 20

format(value,[format_spec])

Answer 20

formats a value according to a spec

Question 21

frozenset([iterable])

Answer 21

frozen set

Question 22

getattr(object, name,[default])

Answer 22

get an attribute with a possible default

Question 23

globals()

Answer 23

return dictionary of global values

Question 24

hasattr(object, name)

Answer 24

returns True or False

Question 25

hash([object])

Answer 25

returns the hash value of an object if it has one

Question 26

help([object])

Answer 26

invokes built-in help system

Question 27

hex(x)

Answer 27

converts int to hex

Question 28

id(object)

Answer 28

integer guaranteed to be unique during it’s lifetime

Question 29

input([prompt])

Answer 29

message with options to read from prompt

Question 30

int(x, base=10)

Answer 30

return an integer with a based specified