# from enum import Enum

# 枚举

# class VIP(Enum):

#     YELLOW =

#     YELLOW_ALIAS =  # 别名

#     GREEN =

#     BLACK =

#     RED = 

# print(VIP.GREEN)        # VIP.GREEN8VIP.GREEN

# print(VIP.GREEN.name)   # GREEN

# print(VIP['GREEN'])     # VIP.GREEN

# for v in VIP:

    # print(v)

# VIP.YELLOW

# VIP.GREEN

# VIP.BLACK

# VIP.RED

# for v in VIP.__members__.items():

#     print(v)

# ('YELLOW', <VIP.YELLOW: >)

# ('YELLOW_ALIAS', <VIP.YELLOW: >)

# ('GREEN', <VIP.GREEN: >)

# ('BLACK', <VIP.BLACK: >)

# ('RED', <VIP.RED: >)

# for v in VIP.__members__:

#     print(v)

# YELLOW

# YELLOW_ALIAS

# GREEN

# BLACK

# RED

# result = VIP.GREEN == VIP.BLACK

# print(result)  # False

# result = VIP.GREEN ==

# print(result)  # False

# result =VIP.GREEN is VIP.GREEN

# print(result)  # True

# a =

# print(VIP(a))  # VIP.YELLOW

# from enum import IntEnum

# class VIP(IntEnum):

#     YELLOW =

#     GREEN =

#     BLACK = 'str'

#     RED = 

from enum import IntEnum,unique

@unique

class VIP(IntEnum):

    YELLOW =

    GREEN =

    BLACK =

    RED = 

# 闭包=函数 + 环境变量

# def curve_pre():

#     a =  # 环境变量

#     def curve(x):

#         # print('this is a function')

#         return a*x*x

#     return curve

# f = curve_pre()

# print(f())   # 

# b =

# def f1(x):

#     return b * x * x

# print(f1())  # 

# a =

# f = curve_pre()

# print(f())  #

# print(f.__closure__)                   # (<cell at 0x00F1C2D0: int object at 0x65DDE490>,)

# print(f.__closure__[].cell_contents)  # 

# c =

# def curve_pre():

#     def curve(x):

#         # print('this is a function')

#         return c*x*x

#     return curve

# c =

# f = curve_pre()

# print(f())  # 

# def f1():

#     a =

#     def f2():

#         a =

#         print(a)  #.

#     print(a)  #.

#     f2()

#     print(a)  #. 

# f1()

# def f1():

#     a =

#     def f2():

#         a =

#         return a

#     return f2

# f = f1()

# print(f)             # <function f1.<locals>.f2 at 0x02AC5198>

# print(f.__closure__) # None

# def f1():

#     a =

#     def f2():

#         return a

#     return f2

# f = f1()

# print(f)             # <function f1.<locals>.f2 at 0x03995198>

# print(f.__closure__) # (<cell at 0x01E0C270: int object at 0x65DDE3A0>,)

# origin =

# def go(step):

#     new_pos = origin + step

#     # origin = new_pos

#     return origin

# print(go()) #

# print(go()) #

# print(go()) # 

# 非闭包的实现

# origin =

# def go(step):

#     global origin

#     new_pos = origin + step

#     origin = new_pos

#     return origin

# print(go()) #

# print(go()) #

# print(go()) # 

# 闭包的实现

origin =

def factory(pos):

    def go(step):

        nonlocal pos

        new_pos = pos + step

        pos = new_pos

        return new_pos

    return go

tourist = factory(origin)

print(tourist())  #

print(tourist())  #

print(tourist())  #