Python built-in module (ii)

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Iv. JSON, pickle data serialization

two modules for serialization

• 
  

  • JSON, used to convert between string and Python data types

  • Pickle for conversion between Python-specific types and Python data types

The JSON module provides four functions: dumps, dump, loads, load

The Pickle module provides four functions: dumps, dump, loads, load

# Pickle.dumps converts data into a string that only Python can recognize in a special form

>>> Import Pickle

>>> data = {' lihongye1 ': ' pwd1 ', ' lihongye2 ': ' Pwd2 '}

>>> p_str = pickle.dumps (data)

>>> Print (P_STR)

or convert a string into a string that only Python can recognize. stored in file

Test = {' user ': ' Lihongye ', ' pwd ': ' pwd1 ', ' num ': ' 123 '}

Import Pickle

FW = open (' Test_file ', ' WB ')

Fw.write (Pickle.dumps (test))

Convert A string to the original data form via Pickle.loads

Import Pickle

FR = Open (' Test_file ', ' RB ')

FRP = Pickle.load (FR)

Print (FRP)

# You can also json.dumps data into a string format that all programs can recognize and write to a file

Test = {' user ': ' Lihongye ', ' pwd ': ' pwd1 ', ' num ': ' 123 '}

Import JSON

FW = open (' Test_file ', ' W ')

Fw.write (Json.dumps (test))

Convert a string to the original data format by using the Json.loads method

Import JSON

FR = Open (' Test_file ', ' R ')

FRP = Json.load (FR)

Print (FRP)

V. Random

Random number

>>> Import Random

>>> random.random () # Random decimals

0.7558096251338481

>>> Random.randint (1,3) # has a range of random numbers 1-3

2

>>> Random.randrange (1,10) # has a range of random numbers 1-9

1

Random Verification Code instances
Import Random

Check_code = ' '

For I in range (4):

Current = Random.randint (0,4)

If current! = I:

TMP = STR (chr (Random.randint (65,90)))

Else

TMP = Random.randint (0,9)

Check_code + = str (current)

Print (Check_code)

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Python built-in module (ii)