# math_utils.py
def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

# 導(dǎo)入整個模塊
import math_utils

print(math_utils.add(2, 3))  # 輸出：5

# 導(dǎo)入模塊中的特定函數(shù)
from math_utils import subtract

print(subtract(5, 2))  # 輸出：3

# 使用別名導(dǎo)入
import math_utils as mu

print(mu.add(4, 6))  # 輸出：10

import math
import random

print(math.sqrt(16))  # 輸出：4.0
print(random.randint(1, 10))  # 輸出：1到10之間的隨機整數(shù)

my_package/
    __init__.py
    math_utils.py
    string_utils.py

# 文件結(jié)構(gòu)
my_package/
    __init__.py
    math_utils.py
    string_utils.py

# math_utils.py
def add(a, b):
    return a + b

# string_utils.py
def to_uppercase(s):
    return s.upper()

# 導(dǎo)入整個包中的模塊
from my_package import math_utils, string_utils

print(math_utils.add(3, 4))  # 輸出：7
print(string_utils.to_uppercase("hello"))  # 輸出：HELLO

# 從模塊中導(dǎo)入特定函數(shù)
from my_package.math_utils import add

print(add(5, 6))  # 輸出：11

print(10 / 0)  # ZeroDivisionError: division by zero
print(undefined_variable)  # NameError: name 'undefined_variable' is not defined

try:
    print(10 / 0)
except ZeroDivisionError:
    print("Cannot divide by zero!")  # 輸出：Cannot divide by zero!

try:
    print(undefined_variable)
except (ZeroDivisionError, NameError) as e:
    print(f"An error occurred: {e}")

try:
    result = 10 / 2
except ZeroDivisionError:
    print("Cannot divide by zero!")
else:
    print(f"Result is {result}")  # 輸出：Result is 5.0
finally:
    print("Execution completed.")  # 輸出：Execution completed.

class CustomError(Exception):
    pass

def check_positive(value):
    if value < 0:
        raise CustomError("Value must be positive!")

try:
    check_positive(-10)
except CustomError as e:
    print(e)  # 輸出：Value must be positive!

calendar_app/
    __init__.py
    event_manager.py
    utils.py

class EventManager:
    def __init__(self):
        self.events = []

    def add_event(self, event):
        self.events.append(event)

    def list_events(self):
        return self.events

    def delete_event(self, event):
        if event in self.events:
            self.events.remove(event)
        else:
            raise ValueError("Event not found!")

def format_event(event):
    return f"Event: {event}"

from calendar_app.event_manager import EventManager
from calendar_app.utils import format_event

manager = EventManager()

# 添加事件
manager.add_event("Meeting at 10 AM")
manager.add_event("Lunch at 12 PM")

# 列出事件
events = manager.list_events()
for event in events:
    print(format_event(event))  # 格式化輸出事件

# 刪除事件
manager.delete_event("Lunch at 12 PM")
print(manager.list_events())  # 輸出：['Meeting at 10 AM']