A summary of commonly used built-in modules in Python

How to import modules

✅import module_name

✅from nodule_name import name1,name2…

✅from module_name import *

✅from module_name import func as domo_func

time module

The time module is a time-related module

()

Delayed execution time

import time

print('hello python world')
(2.0)  # Delay execution for 2 secondsprint('life is short,i use python')

()

Second time stamp

import time

# The timestamp represents the offset calculated in seconds starting from 00:00:00 on January 1, 1970print(())

()

Check local time

import time

print(())

()

Custom time format Receives time tuples and returns the local time represented by strings, the format is determined by the parameter format

import time

print(('%Y-%m-%d %H:%M:%S'))

Common formatting parameters in strfttime

datetime()

💡datetime is also a time-related module, but not a module in time, you need to import it?

() Output the current time

import datetime

print(())

random module

random module is a random module

()

Randomly generated number of [0,1)

import random

print(()) 

()

Randomly generate integers

import random

print((1, 5))

()

Randomly take elements in sequence

import random

print(('1234hello python world'))

()

import random

li = [1, 4, 7, 5, 3, 0]
# Unorder the passed container, note 1: What is changed is the container itself.  Note 2: Containers cannot be tuples(li)  # Randomly arrange list elementsprint(li)

()

Random integer

import random

print((1, 10, 2))  # Randomly fetched1,3,5,7,9

()

Random sampling

import random

li = [1, 4, 6, 5, 18, 2, 9, 7]
print((li, 3))  # Random fromliTake three elements in the list

💖 Extension: Use random module to implement 6-bit random verification code

import random


def rd():
    res = ''
    for i in range(6):
        num = (0, 9)

        res += str(num)
    print(res)


rd()

import random

res = (range(0, 9), 6)
f_li = list(map(str, res))  # Map --> Pass each element in res to str one by one for strong rotation, and returnprint("".join(f_li))

json module

JSON is a widely used lightweight data format. The json module provides the processing function of JSON data. Since JSON and dictionary formats are very similar, the json module is also used to convert json and dictionary. But be aware that the data in json must be wrapped in double quotes

()

Convert json to dictionary (applicable to statements)

import json

json_data = '{"name": "hacker"}'

dict_data = (json_data)
print(dict_data)

()

Convert dictionary to json (applicable to statements)

import json

dict_data = {"name": "hacker"}
json_data = (dict_data)
print(json_data)

()

Convert json to dictionary (for files)

()

Convert dictionary to json (for files)

OS module

OS modules are modules related to operating systems

()

Used to print the current working directory

import os

print(()) # D:\pythonExample\object

()

Change the current working directory

import os

print(())  # D:\python instance\object(r'D:\python instance\python')  # Add r to prevent escapeprint(())  # D:\pythonExample\python

()

Create multiple folders in recursive form

import os
# If the folder exists, an error will be reported(r'/home/response/hacker')

()

Recursively delete multiple empty folders

import os

# Non-empty deletion will report an error(r'/home/response/hacker')

()

Create a single folder

import os
# Only create single folders(r'hacker')

()

Delete a single folder

import os
# Only create single folders(r'hacker')

()

Determine whether the file or folder exists in this path

import os
# When it exists, it returns True, but when it does not exist, it returns Falseprint(('images'))

()

Splicing path

import os

print(((), "happy"))

sys module

The sys module is a module that interacts with the python interpreter

[]

[0]—>Program itself file path

[1]—> Parameters passed during external runtime

()

Used to exit the program

The above are the commonly used built-in modules for Python compiled by bloggers

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