1.python-quiz-for-beginner
2.python-quiz-for-beginner
3.python-quiz-for-beginner
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5.python-quiz-for-beginner
6.python-quiz-for-beginner

复习

虚拟环境

• 创建python虚拟环境 (windows平台）

C:\python\python3.10\python.exe -m venv my_venv # my_venv:任意命名，虚拟环境变量名

• 激活python虚拟环境变量

  my_venv\scripts\activate.bat

• 在虚拟环境里面安装python包

  pip install xxx -i https://pypi.tuna.tsinghua.edu.cn/simple # 指定使用国内清华源

notebook in VS Code

实战练习

• 赛车 cargame.zip
• 一些pattern demo python sample code

简单练习

鸡兔同笼程序

def calculate_chicken_rabbit(heads, legs):
    """
    Calculates the number of chickens and rabbits given the total number of heads and legs.

    Args:
        heads (int): Total number of heads.
        legs (int): Total number of legs.

    Returns:
        tuple: A tuple containing the number of chickens and rabbits, respectively. Returns (-1, -1) if no solution is possible.
    """
    for chickens in range(heads + 1):
        rabbits = heads - chickens
        if (2 * chickens) + (4 * rabbits) == legs:
            return chickens, rabbits

    return -1, -1


# Test the function
total_heads = int(input("Enter the total number of heads: "))
total_legs = int(input("Enter the total number of legs: "))

chickens, rabbits = calculate_chicken_rabbit(total_heads, total_legs)

if chickens == -1 and rabbits == -1:
    print("No solution possible.")
else:
    print("Number of chickens:", chickens)
    print("Number of rabbits:", rabbits)

'''
example 1:
Enter the total number of heads: 5
Enter the total number of legs: 14
Number of chickens: 3
Number of rabbits: 2
'''
'''
example 2:
Enter the total number of heads: 3
Enter the total number of legs: 8
Number of chickens: 2
Number of rabbits: 1
'''

'''
example 3
Enter the total number of heads: 2
Enter the total number of legs: 10
No solution possible.
'''

汇率转换程序

• API使用，获取汇率信息

• 简单的计算，转换
  参考代码

  import requests
  import json

url = 'http://data.fixer.io/api/latest?access_key=***267b3317dd4ef8af6760ac3c38c9b'

response = requests.get(url)
print(response.text)

json_object = json.loads(response.text)
print(f"base currency: {json_object['base']}")
print(f"to CNY rate: {json_object['rates']['CNY']}")
print(f"to USD rate: {json_object['rates']['USD']}")

汇率API,网上有很多免费的API，一般都需要注册一下，获取一个API key，然后根据API文档组合request url，访问服务器，获取返回数据，一般以json格式构成，如：

url： http://data.fixer.io/api/latest?access_key=***267b3317dd4ef8af6760ac3c38c9b

返回的结果， response.text

{
        "success": true,
        "timestamp": 1519296206,
        "base": "EUR",
        "date": "2023-07-09",
        "rates": {
            "AUD": 1.566015,
            "CAD": 1.560132,
            "CHF": 1.154727,
            "CNY": 7.827874,
            "GBP": 0.882047,
            "JPY": 132.360679,
            "USD": 1.23396,
        [...]
        }
    }

将字符串转换为json object

json_object = json.loads(response.text)

访问对应的字段，比如基础货币，人民币，美元对应的汇率

print(f"base currency: {json_object['base']}")
print(f"to CNY rate: {json_object['rates']['CNY']}")
print(f"to USD rate: {json_object['rates']['USD']}")

剩下的就是简单计算，基于这些信息，可以编写一个实时计算汇率转换的程序