# 不明確的寫法
age = "18"      # 看起來(lái)是數(shù)字，其實(shí)是字符串
result = age + 5  # 這里會(huì)出錯(cuò)！

# 明確的寫法
age: int = 18    # 明確告訴Python：age是整數(shù)
result = age + 5  # 正確：18 + 5 = 23

# 整數(shù)
student_age: int = 18
student_count: int = 45

# 小數(shù)
student_height: float = 175.5
average_score: float = 87.5

# 字符串
student_name: str = "小明"
school_name: str = "第一中學(xué)"

# 布爾值
is_student: bool = True
is_graduated: bool = False

# 整數(shù)列表
score_list: list = [90, 85, 78, 92]
age_list: list = [18, 19, 17, 18]

# 小數(shù)列表
temperature_list: list = [36.5, 37.0, 36.8]
price_list: list = [12.5, 8.9, 15.0]

# 字符串列表
student_list: list = ["小明", "小紅", "小剛"]
subject_list: list = ["數(shù)學(xué)", "語(yǔ)文", "英語(yǔ)"]

# 學(xué)生基本信息（姓名，年齡，身高）
student_info: tuple = ("小明", 18, 175.5)
coordinates: tuple = (39.9, 116.4)  # 經(jīng)緯度

# 顏色RGB值
color_red: tuple = (255, 0, 0)
color_white: tuple = (255, 255, 255)

# 數(shù)據(jù)庫(kù)配置（主機(jī)，端口，用戶名，密碼）
db_config: tuple = ("localhost", 3306, "admin", "password")
app_settings: tuple = ("MyApp", "1.0.0", True)

# 學(xué)生ID集合（自動(dòng)去重）
student_ids: set = {1001, 1002, 1003, 1001, 1004}
unique_tags: set = {"python", "programming", "tutorial", "python"}

# 課程標(biāo)簽
course_tags: set = {"基礎(chǔ)", "進(jìn)階", "實(shí)戰(zhàn)", "項(xiàng)目"}

# 用戶權(quán)限
user_permissions: set = {"read", "write", "execute"}
admin_roles: set = {"super_admin", "content_admin", "user_admin"}

# 定義學(xué)生信息
student: dict = {
    "name": "小明",
    "age": 18,
    "score": 95,
    "is_monitor": True
}

class_info: dict = {
    "class_name": "三年級(jí)二班",
    "student_count": 45,
    "teacher": "張老師"
}

# 各科成績(jī)
score_dict: dict = {
    "math": 95,
    "chinese": 88,
    "english": 92,
    "physics": 85
}

# 基礎(chǔ)信息
class_name: str = "三年級(jí)二班"
student_count: int = 30
average_score: float = 87.5
is_excellent_class: bool = True

# 列表 - 有序可重復(fù)數(shù)據(jù)
student_list: list = ["小明", "小紅", "小剛", "小麗"]
score_list: list = [95, 92, 88, 90, 85]

# 元組 - 不可變配置數(shù)據(jù)
class_config: tuple = (2024, "A班", "張老師")
color_scheme: tuple = (255, 255, 255)  # 白色

# 集合 - 不重復(fù)數(shù)據(jù)
subject_set: set = {"數(shù)學(xué)", "語(yǔ)文", "英語(yǔ)", "物理", "數(shù)學(xué)"}  # 自動(dòng)去重
permission_set: set = {"read", "write"}

# 字典 - 鍵值對(duì)數(shù)據(jù)
student_dict: dict = {
    "小明": {"age": 18, "score": 95},
    "小紅": {"age": 17, "score": 92}
}

subject_average: dict = {
    "math": 89.5,
    "chinese": 87.0,
    "english": 91.2
}

# 使用這些變量
print(f"班級(jí)：{class_name}")
print(f"學(xué)生名單：{student_list}")
print(f"唯一科目：{subject_set}")
print(f"班級(jí)配置：{class_config}")

# 集合的去重特性演示
duplicate_numbers = [1, 2, 2, 3, 4, 4, 5]
unique_numbers: set = set(duplicate_numbers)
print(f"去重前：{duplicate_numbers}")
print(f"去重后：{unique_numbers}")

# 沒(méi)有類型定義 - 需要猜
data1 = ["小明", 18, 95]
data2 = (39.9, 116.4)
data3 = {1, 2, 3}

# 有類型定義 - 一目了然
student_data: list = ["小明", 18, 95]
coordinates: tuple = (39.9, 116.4)
number_set: set = {1, 2, 3}

# 元組不可修改的特性
colors: tuple = ("red", "green", "blue")
# colors[0] = "yellow"  # 這會(huì)報(bào)錯(cuò)！

# 正確做法是創(chuàng)建新的元組
new_colors: tuple = ("yellow", "green", "blue")

# 自動(dòng)去重
tags: set = {"python", "編程", "教程", "python", "編程"}
print(tags)  # 輸出：{'python', '編程', '教程'} 自動(dòng)去重

# 個(gè)人信息字典
personal_info: dict = {
    "name": "張三",
    "age": 20,
    "city": "北京"
}

# 愛(ài)好列表
hobbies: list = ["讀書", "編程", "運(yùn)動(dòng)", "音樂(lè)"]

# 技能集合（自動(dòng)去重）
skills: set = {"Python", "Java", "SQL", "Python"}  # 結(jié)果：{'Python', 'Java', 'SQL'}

# 出生日期元組（年，月，日）
birth_date: tuple = (2000, 5, 15)