python 库基础

• Packages
• • `1. 结构`
  • `2. Import`

food_store/
    __init__.py
    
    product/
        __init__.py
        
        fruit/
            __init__.py
            apple.py
            banana.py
            
        drink/
            __init__.py
            juice.py
            milk.py
            beer.py

    cashier/
        __ini__.py
        receipt.py
        calculator.py

假设banana.py文件内容如下:

def get_available_brands():
    return ['chiquita']


class Banana:
    def __init__(self, brand='chiquita'):
        if brand not in get_available_brands():
            raise ValueError('Unkown brand: {}'.format(brand))
        self._brand = brand
     

from food_store.product.fruit.banana import Banana

my_banana = Banana()

from food_store.product.fruit import banana

brands = banana.get_available_brands()
my_banana = banana.Banana()