Lesson 99 +10 XP

Cheatsheet: Built-in Functions

Cheatsheet: Built-in Functions

The functions Python always has available, no import needed.

Everyday essentials

Function	Job
`print()`	Print to the screen
`len()`	Length of a collection
`type()`	Type of a value
`int()`, `float()`, `str()`	Casting
`input()`	Read user input
`range()`	Generate number sequences
`enumerate()`	Index and item pairs
`zip()`	Pair up multiple sequences
`min()`, `max()`	Smallest / largest
`sum()`	Add up a sequence
`abs()`	Absolute value
`round()`	Round a number
`sorted()`	Return a sorted copy
`reversed()`	Return a reversed iterator

Collection constructors

list(), tuple(), set(), dict(), frozenset().

Check types

isinstance(x, int) checks a value's type.

Example

nums = [3, 1, 2]
print(sum(nums))          # 6
print(sorted(nums))       # [1, 2, 3]
print(list(enumerate(nums)))  # [(0, 3), (1, 1), (2, 2)]

TL;DR

Built-ins need no import.
len, print, type, and casting are the core set.
sorted() copies; sort() sorts in place.
min, max, sum, abs, round handle numbers.