name = 'sugar'
age = 21
print("His name is %s, and he is %d year old." %(name, age))

price = 23.1999
obj = 'milk'

print("The %s's price is %03f" %(obj, price))  # 前面補三個零
print("The %s's price is %3.0f" %(obj, price))  # 最小總占位長度為3，控制輸出0個小數(shù)
print("The %s's price is %3.3f" %(obj, price))  # 最小總占位長度為3，控制輸出3個小數(shù)
print("The %s's price is %5.4f" %(obj, price))  # 最小總占位長度為5，控制輸出4個小數(shù)

price = 23.1999
obj = 'milk'
print("The {}'s price is {}".format(obj, price))

price = 23.1999
obj = 'milk'
print("The {0}'s price is {1}".format(obj, price))

price = 23.1999
obj = 'milk'
info = [obj, price]
print("The {}'s price is {}".format(*info))  # 對info進行解包

price = 23.1999
obj = 'milk'
print("The {name}'s price is {pri}".format(name=obj, pri=price))

# 更進一步，對字典進行解包
dic = {'name':'milk', 'pri':23.1999}
print("The {name}'s price is {pri}".format(**dic))

price = 23.1999
obj = 'bread'
print("The {}'s price is {:.2f}".format(obj, price))  # 使用默認位置方式，保留兩位小數(shù)
print("The {0}'s price is {1:.2f}".format(obj, price))  # 使用指定位置方式，保留兩位小數(shù)
print("The {name}'s price is {price:.2f}".format(name=obj, price=price))  # 使用字典方式，保留兩位小數(shù)

li = [obj, price]
print("The {}'s price is {:.2f}".format(*li))  # 使用列表解包的方式，保留兩位小數(shù)

info = {'name':obj, 'price':price}
print("The {name}'s price is {price:.2f}".format(**info))  # 使用字典解包的方式，保留兩位小數(shù)