Built-in Types in Python

Core Data Types

The principal built-in types are numerics, sequences, mappings, classes, instances and exceptions.

Built-in objects preview:

Object type:
Numbers
int, float, complex.
Strings
'spam', "Bob's", b'a\x01c', u'sp\xc4m'
Lists
[1, [2, 'three'], 4.5],list(range(10))
Dictionaries
{'food': 'spam', 'taste': 'yum'},dict(hours=10)
Tuples
(1, 'spam', 4, 'U'),tuple('spam'),namedtuple
Files
open('eggs.json')
Sets
set('abc'),{'a', 'b', 'c'}
Other core types
Booleans, types, None
Program unit types
Functions, modules, classes
Implementation-related types
Compiled code, stack tracebacks

Numeric Types

There are three distinct numeric types: integers, floating point numbers, and complex numbers.

# Built-in Types
# Numeric Types
import math

# Integer addition
print(123+345)

# 2 to the power 100, again
print(2**100)

# math module
print(math.pi)

468
1267650600228229401496703205376
3.141592653589793

Sequence Types

There are three basic sequence types: lists, tuples, and range objects.

# Built-in Types
# Sequence Types

# in operations
print("yt" in "byte")

# lists
lists = [[]] * 3
lists = [[] for i in range(3)]
print(lists)

True
[[], [], []]

Mapping Types

A mapping object maps hashable values to arbitrary objects. Mappings are mutable objects.

# Built-in Types
# Mapping Types

d = dict(a=1, b=2, c=3)
e = {'a':1, 'b':2}