Two: Python object type

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1, why use built-in types:

A) built-in objects make programs easier to write

b) Built-in objects are extended components

c) Built-in objects tend to be more efficient than custom data structures

d) Built-in objects are part of the language standard

Main built-in objects for 2,python

Object Type Example Constants/create

Digital 1234,3.1415,3+4j,decimal (decimal), fraction (fractional)

The string ' spam ', ' hello,world ' "is immutable, read by relative position, can redefine a string, and take the same variable name, Python will clean up the old object during the run."

list [1,2,3,4,[5, ' spam ']] "ordered set, can be nested, can be dynamically increased or decreased, by relative position to read"

Dictionary {' Work ': ' Zhangfei ', ' Age ': 24} ' can be nested, can be dynamically added and subtracted '

Tuples (1, ' spam ', 4, ' U ') "immutability"

File MyFile = open (' Data.txt ', ' R ')

Set set (' abc '), {' A ', ' B ', ' C '}

Other type types, None,bool

Programming unit type functions, modules, classes

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Two: Python object type