learn-python/closure.py at master · cscis/learn-python · GitHub

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def hellocounter (name):

count=0 #PYTHON 2.x 中，要写count=[0]

def counter():

nonlocal count #PYTHON 2.x 中，此行和下一行要换成count[0]+=1

count+=1

print('Hello,',name,',',count,' access!')#PYTHON 2.x 中请自觉换成str(count[0])

return counter

hello = hellocounter('ma6174')

hello()

'''

执行结果

>>> hello()

Hello, ma6174 , 1 access!

>>> hello()

Hello, ma6174 , 2 access!

>>> hello()

Hello, ma6174 , 3 access!

'''

##为什么PYTHON 2.x中不直接写count而用list？这是python2的一个bug,如果用count话,会报这样一个错误:

##UnboundLocalError: local variable 'count' referenced before assignment.

def make_adder(addend):

def adder(augend):

return augend + addend

return adder

p = make_adder(23)

q = make_adder(44)

print(p(100))

print(q(100))

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