base64模块：提供Base64编码和解码功能。

import base64

# 编码字符串
encoded_string = base64.b64encode(b'Hello World')

# 解码字符串
decoded_string = base64.b64decode(encoded_string)

struct模块：提供二进制数据和Python值之间的转换功能。

import struct

# 打包数据
packed_data = struct.pack('i', 123)

# 解包数据
unpacked_data = struct.unpack('i', packed_data)

hashlib模块：提供常用的哈希算法功能。

ort hashlib

# 计算字符串的MD5哈希值
md5_hash = hashlib.md5(b'Hello World').hexdigest()

# 计算字符串的SHA256哈希值
sha256_hash = hashlib.sha256(b'Hello World').hexdigest()

csv模块：提供CSV文件的读写功能。

import csv

# 读取CSV文件
with open('data.csv', 'r') as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)

# 写入CSV文件
data = [['Name', 'Age'], ['John', 30], ['Jane', 25]]
with open('data.csv', 'w', newline='') as file:
    writer = csv.writer(file)
    writer.writerows(data)

15.wav模块：提供读取和写入WAV音频文件的功能。

import wave

# 读取WAV文件
with wave.open('audio.wav', 'rb') as file:
    # 获取音频参数
    sample_width = file.getsampwidth()
    sample_rate = file.getframerate()
    num_channels = file.getnchannels()
    num_frames = file.getnframes()

# 写入WAV文件
with wave.open('audio.wav', 'wb') as file:
    file.setsampwidth(2)
    file.setframerate(44100)
    file.setnchannels(2)
    file.setnframes(1000)
    file.writeframes(b'audio_data')