Python实战练习示例

以下是一些Python实战练习示例，涵盖不同难度和主题：

1. 数字求绝对值：

   import math
   num = -10
   abs_value = math.abs(num)
   print("The absolute value of", num, "is", abs_value)
   

2. 骰子模拟器：
   ```python
   import random

def roll_dice():
return random.randint(1, 6)

while True:
print("You rolled a:", roll_dice())

3. **斐波那契数列**：
```python
def fibonacci(n):
    if n <= 0:
        return []
    elif n == 1:
        return [0]
    elif n == 2:
        return [0, 1]
    else:
        fib_seq = [0, 1]
        for i in range(2, n):
            fib_seq.append(fib_seq[i-1] + fib_seq[i-2])
        return fib_seq

print(fibonacci(10))

1. 猜数字游戏：
   ```python
   import random

def game():
number_to_guess = random.randint(1, 100)
attempts = 0

while True:
    user_guess = int(input("Guess a number between 1 and 100: "))
    attempts += 1

    if user_guess == number_to_guess:
        print("Congratulations! You guessed the number in", attempts, "attempts.")
        break
    elif user_guess < number_to_guess:
        print("Too low!")
    else:
        print("Too high!")

game()

5. **操作重载示例（< 运算符）**：
```python
class Game:
    def __init__(self, score):
        self.score = score

    def __lt__(self, other):
        return self.score < other.score

first = Game(1)
second = Game(2)
print(first < second)  # 输出: True

1. 文件读写操作：
   ```python
   with open("example.txt", "w") as file:
   file.write("Hello, World!")

with open("example.txt", "r") as file:
contents = file.read()
print(contents)

7. **网页抓取（使用requests和BeautifulSoup库）**：
```python
import requests
from bs4 import BeautifulSoup

url = "https://example.com"
response = requests.get(url)
soup = BeautifulSoup(response.text, "html.parser")

for link in soup.find_all("a"):
    print(link.get("href"))

这些示例涵盖了基础的数学运算、随机数生成、递归算法、用户交互、类和对象、文件操作以及网络请求和网页解析等主题。根据你的需求和水平，可以选择适合的示例进行实践和学习。