# 字符串
name = "小明"
message = f"你好，{name}！"
# 数字
age = 25
height = 1.75
# 布尔值
is_student = True
# 列表
fruits = ["苹果", "香蕉", "橙子"]
# 字典
person = {
    "姓名": "小明",
    "年龄": 25,
    "城市": "上海"
}

# 条件判断
if age >= 18:
    print("已成年")
else:
    print("未成年")
# 循环
for fruit in fruits:
    print(f"我喜欢{fruit}")
# while 循环
count = 0
while count < 3:
    print(f"计数：{count}")
    count += 1

def greet(name, age=18):
    """
    问候函数
    """
    return f"你好，{name}！你今年{age}岁。"
# 调用函数
message = greet("小红", 22)
print(message)

class Student:
    def __init__(self, name, grade):
        self.name = name
        self.grade = grade
        self.courses = []
    def add_course(self, course):
        self.courses.append(course)
        print(f"{self.name} 选修了 {course}")
    def get_info(self):
        return f"学生：{self.name}，年级：{self.grade}"
# 创建对象
student = Student("小李", "高二")
student.add_course("数学")
print(student.get_info())

import requests
response = requests.get("https://api.github.com/users/octocat")
data = response.json()
print(data["name"])

import pandas as pd
# 读取 CSV 文件
df = pd.read_csv("data.csv")
# 数据查看
print(df.head())
print(df.describe())

import matplotlib.pyplot as plt
x = [1, 2, 3, 4, 5]
y = [2, 4, 6, 8, 10]
plt.plot(x, y)
plt.title("简单线图")
plt.xlabel("X 轴")
plt.ylabel("Y 轴")
plt.show()

def calculator():
    print("简单计算器")
    print("支持操作：+, -, *, /")
    while True:
        try:
            num1 = float(input("请输入第一个数字："))
            operator = input("请输入操作符 (+, -, *, /)：")
            num2 = float(input("请输入第二个数字："))
            if operator == "+":
                result = num1 + num2
            elif operator == "-":
                result = num1 - num2
            elif operator == "*":
                result = num1 * num2
            elif operator == "/":
                if num2 != 0:
                    result = num1 / num2
                else:
                    print("错误：除数不能为零！")
                    continue
            else:
                print("错误：不支持的操作符！")
                continue
            print(f"结果：{num1} {operator} {num2} = {result}")
            if input("继续计算？(y/n)：").lower() != 'y':
                break
        except ValueError:
            print("错误：请输入有效的数字！")
calculator()

import requests
def get_weather(city):
    """
    获取指定城市的天气信息
    需要申请 API Key
    """
    api_key = "your_api_key"
    url = f"http://api.openweathermap.org/data/2.5/weather"
    params = {
        "q": city,
        "appid": api_key,
        "units": "metric",
        "lang": "zh_cn"
    }
    try:
        response = requests.get(url, params=params)
        data = response.json()
        if response.status_code == 200:
            temp = data["main"]["temp"]
            desc = data["weather"][0]["description"]
            humidity = data["main"]["humidity"]
            print(f"{city} 当前天气：")
            print(f"温度：{temp}°C")
            print(f"天气：{desc}")
            print(f"湿度：{humidity}%")
        else:
            print(f"获取天气信息失败：{data['message']}")
    except Exception as e:
        print(f"网络错误：{e}")
# 使用示例
city_name = input("请输入城市名称：")
get_weather(city_name)