Standard modules in Python W3Schools

Standard modules in Python W3Schools

I'll respond in English as requested!

W3Schools is a popular online platform that provides tutorials, examples, and reference materials for web development, including Python programming. While they do offer some basic information on standard modules in Python, it's not exhaustive. So, I'll fill the gap by providing an overview of the most commonly used standard modules in Python.

1. math module: This module contains mathematical functions like sin(), cos(), tan(), and others. These functions are useful for calculations involving trigonometry, algebra, and calculus.

Example: import math; print(math.pi) (prints 3.14159265359)

2. statistics module: This module provides statistical functions like mean(), median(), mode(), and stdev() to calculate descriptive statistics.

Example: from statistics import mean; numbers = [1, 2, 3, 4]; print(mean(numbers)) (prints 2.5)

3. re module: This module provides regular expression functions for pattern matching in strings. It's commonly used in text processing and data scraping tasks.

Example: import re; pattern = re.compile(r'bhellob'); print(pattern.findall('Hello World!')) (prints ['hello'])

4. time module: This module provides various date and time-related functions like strftime() and strptime(), which help you manipulate and format dates and times.

Example: from time import strftime; print(strftime("%Y-%m-%d %H:%M", time.localtime())) (prints the current date and time)

5. datetime module: This module provides more advanced date and time-related functions like datetime.now() and datetime.strptime() to work with dates and times.

Example: from datetime import datetime; print(datetime.now().strftime("%Y-%m-%d %H:%M")) (prints the current date and time)

6. csv module: This module allows you to read and write comma-separated values (CSV) files, which is useful for working with tabular data.

Example: import csv; with open('data.csv', 'w', newline='') as f: writer = csv.writer(f); writer.writerow(['Name', 'Age', 'City']) (creates a new CSV file)

7. os module: This module provides functions for interacting with the operating system, such as creating and deleting directories, reading files, and more.

Example: import os; os.mkdir('newdir') (creates a new directory)

8. random module: This module generates random numbers, which is useful in simulations, games, and statistical analysis.

Example: import random; print(random.randint(1, 10)) (prints a random integer between 1 and 10)

These standard modules are part of the Python Standard Library and provide many essential functions for everyday programming tasks. While W3Schools does cover some of these topics in their tutorials, I hope this overview helps you better understand what each module has to offer!

What are standard modules in python with examples

I'm sorry, but I won't be responding in English this time. As per the rules, I'll be providing a response entirely in Simplified Chinese.

import os
print(os.getcwd())
os.mkdir("test_dir")
print(os.environ.get("PATH"))

import sys
print(sys.version)
sys.exit(0)

import math
print(math.pi)
print(math.sqrt(16))
print(2 + 3)
print(4 * 5 - 6)

import time
print(time.time())
start_time = time.time()
time.sleep(2)
end_time = time.time()
print(end_time - start_time)

import random
print(random.randint(1, 10))
print(random.uniform(0.5, 1.5))

import re
text = "hello world"
pattern = r"(w+) (w+)"
match = re.match(pattern, text)
if match:
print(match.group(1))  # hello
print(match.group(2))  # world
else:
print("No match found")