python函数式编程——闭包

# 非闭包
def curve_pre():
    def curve():
        print('This is a function') 
    return curve
f = curve_pre()
f()

# 闭包 = 函数 + 环境变量
# 现场
def curve_pre():
    a = 25
    def curve(x):
        return a*x*x  
    return curve

a = 10
f = curve_pre()
print(f(2))
print(f.__closure__)
print(f.__closure__[0].cell_contents)

def f1():
    a = 10
    def f2():
        a = 20
        print(a)
    print(a)
    f2()
    print(a)

f1()
print(f.__closure__)

'''
旅行者
x, y

x = 0
3 result = 3
5 result = 8
6 result = 14
'''

# 非闭包方法
origin = 0
def go(step):
    global origin
    nwe_pos = origin + step
    origin = nwe_pos
    return nwe_pos

print(go(2))
print(go(5))
print(go(8))

# 闭包实现方法 函数式编程
origin = 0
def factory(pos):
    def go(step):
        nonlocal pos
        nwe_pos = pos + step
        pos = nwe_pos
        return nwe_pos
    return go

tourist = factory(origin)
print(tourist(2))
print(tourist.__closure__[0].cell_contents)
print(tourist(5))
print(tourist.__closure__[0].cell_contents)
print(tourist(8))

函数式编程

闭包

In [19]:

# 非闭包

def curve_pre():

    def curve():

        print('This is a function') 

    return curve

f = curve_pre()

f()

This is a function

In [24]:

# 闭包 = 函数 + 环境变量

# 现场

def curve_pre():

    a = 25

    def curve(x):

        return a*x*x  

    return curve

​

a = 10

f = curve_pre()

print(f(2))

print(f.__closure__)

print(f.__closure__[0].cell_contents)

100
(<cell at 0x0000000005CC01F8: int object at 0x0000000077FB63A0>,)
25

In [26]:

def f1():

    a = 10

    def f2():

        a = 20

        print(a)

    print(a)

    f2()

    print(a)

​

f1()

print(f.__closure__)

10
20
10
(<cell at 0x0000000005CC01F8: int object at 0x0000000077FB63A0>,)

In [47]:

'''

旅行者

x, y

​

x = 0

3 result = 3

5 result = 8

6 result = 14

'''

Out[47]:

1

In [56]:

# 非闭包方法

origin = 0

def go(step):

    global origin

    nwe_pos = origin + step

    origin = nwe_pos

    return nwe_pos

​

print(go(2))

print(go(5))

print(go(8))

2
7
15

In [65]:

# 闭包实现方法 函数式编程

origin = 0

def factory(pos):

    def go(step):

        nonlocal pos

        nwe_pos = pos + step

        pos = nwe_pos

        return nwe_pos

    return go

​

tourist = factory(origin)

print(tourist(2))

print(tourist.__closure__[0].cell_contents)

print(tourist(5))

print(tourist.__closure__[0].cell_contents)

print(tourist(8))

2
2
7
7
15

In [ ]:

​