Python Core programming--python objects

First, what is a Python object

In Python, a value of any type constructed is an object. For example, a value of an integer type, a string, a list, and so on, can be considered as objects.

All objects are divided into three parts:

(1) identity. Each object has an ID that identifies itself. Available built-in function ID () view

(2) type. Available type () view

(3) value. Objects are used to hold data, and the most important data of course is its value.

Second, the standard type

Number, Integer, Boolean, Long Integer, float, complex, string, list, tuple, dictionary, module, class

Third, slicing objects

Step slices, multidimensional slices

(1) Step slice sequence[start index: End index: Step value]

>>> List1 = [1,2,3,4,5,6,7,8]>>> list1[0:7:2][1, 3, 5, 7]

(2) multi-dimensional slicing sequence[star1:end1,start2:end2]

Iv. standard types of built-in functions

(1) type () return types

(2) CMP (A, B) returns a positive integer if a>b, or a negative integer if a<b

(3) Str () converted to character type

V. Types of factories

Int (), long,float () ....

Python Core programming--python objects