We know now the major language has its serialization and de-serialization of data mode,

Such as php's serialize and unserialize functions

Python course, there are the official library provides a library of known pickle

String serialization Explanation

import pickle

x = "yuaneuro"
y = pickle.dumps(x) # 序列化
print(y)

An example of the above sequence of python pickle string

operation result:
b'\x80\x03X\x08\x00\x00\x00yuaneuroq\x00.'

Explanation:

Frontmost b '' represents a bytes object which is
the first character \ X80 is an opcode, is to identify the pickle protocol
\ X03 represents the pickle Third Edition version (version is implemented to python3 third edition)
\ X08 \ x00 \ x00 \ x00, 8 value representing the length of the string behind utf8 encoding is 8, i.e., the length of 8 yuaneuro
later access yuaneuro
then again a q \ x00, indexed by the parameters to
the final. mean the end

Tuple (tuple) serialization explanation

import pickle

x = ('bar','foo')
y = pickle.dumps(x) # 序列化
print(y)

An example of the above sequence of python pickle tuple

operation result:
b'\x80\x03X\x03\x00\x00\x00barq\x00X\x03\x00\x00\x00fooq\x01\x86q\x02.''

Explanation:

Serialized string as the front
at the end of the two strings plus \ x86 opcodes, means "with two elements of the stack (i.e., bar and fo'o) establishment of a tuple
q \ x02 identifying the element in the group's index memo

List (list) serialization explanation

import pickle

x = ['bar','foo']
y = pickle.dumps(x) # 序列化
print(y)

An example of the above sequence of python pickle list

operation result:
b'\x80\x03]q\x00(X\x03\x00\x00\x00barq\x01X\x03\x00\x00\x00fooq\x02e.'

Explanation:

In \ x03 is a rear ]operator, meaning that create an empty list on the stack
q \ x00 is the list of the index memo
from (the start to ethe foregoing operation of the contents of that used to construct the list

Dictionary (dict) serialization explanation

import pickle

x = {'name':'yuaneuro', 'age':'20'}
y = pickle.dumps(x) # 序列化
print(y)

An example of the above sequence of python pickle dictionaries

operation result:
b'\x80\x03}q\x00(X\x04\x00\x00\x00nameq\x01X\x08\x00\x00\x00yuaneuroq\x02X\x03\x00\x00\x00ageq\x03X\x02\x00\x00\x0020q\x04u.'

Explanation:

In \ x03 is a rear }operator, meaning that create an empty dict on the stack
q \ x00 dict shows the memo area index
from }the start to uthe front of the contents of that operation is used to build dict

Category (class) of serialization Explanation

import pickle

class Student(object):
    name = 'yuaneuro'
    age = '20'

y = pickle.dumps(Student())
print(y)

In the above example of a sequence of python pickle class

operation result:
b'\x80\x03c__main__\nStudent\nq\x00)\x81q\x01.'

Explanation:

cOperator, for introduction between a module identifier and the module identifier \nspaced apart
so introduced is meant herein main module Studentclass
q \ x00 Student class index represents the memo
followed )established on the stack a new tuple, the tuple is stored parameters when a need to provide new objects, since no parameters in the present embodiment, the tuple is null
\ X81 operator, the operator calls the cls.__new__method to create an object, the method accept parameters preceding tuple