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closure.py
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35 lines (30 loc) · 856 Bytes
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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()
hello()
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))