模块

此处以 random、正则、socket 为例

1. random

# random
import random

# 随机小数
print(random.random())

# 1 - 10 之间的随机数
print(random.randint(1, 10))

2. 正则

# 正则
import re

# \d 数字
result = re.match(r'\d+', '123abc')
print(result)  # 123

# \w 数字、字母、下划线
result = re.match(r'\w+', '1a2b3c!')
print(result)  # 1a2b3c

# \s 空白字符串；\S 非空字符串
result = re.match(r'^\s+$', '1 2 3')
print(result)  # None

result = re.match(r'^\S+$', '1 abc')
print(result)  # None

# . 任意字符
result = re.match(r'.+$', 'abc 1q2')
print(result)  # abc 1q2

# [] 区间
result = re.match(r'^a[1a]', 'a123456')
print(result)  # a1

# | 或
result = re.match(r'^a|1|c$', 'a12345c')
print(result)  # a

3. socket

3.1 server

# socket
import socket

sk = socket.socket()
sk.bind(('127.0.0.1', 8088))
sk.listen(5)

conn, addr = sk.accept()
print(conn)
print(addr)

while True:
    accept_data = conn.recv(1024)
    print('收到客户端发送的消息：', accept_data.decode('utf-8'))
    send_data = input('请输入要回复的消息：')
    conn.send(send_data.encode('utf-8'))

3.2 client

# socket
import socket

sk = socket.socket()
sk.connect(('127.0.0.1', 8088))

while True:
    sand_data = input('请输入要发送的消息：')
    sk.send(sand_data.encode('utf-8'))
    accept_data = sk.recv(1024)
    print(accept_data.decode('utf-8'))