demo1:
def func():
a = 1
b = 2
return a+b
def sum(a):
def add(b):
return a+b
return add
num1 = func()
num2 = sum(2)
print(type(num1))
print(type(num2))
print(num2(8))
demo2:
def counter():
cnt = [0]
def add_one():
cnt[0] += 1
return cnt[0]
return add_one
num1 = counter()
print(num1())
print(num1())
print(num1())
print("n")
def counter(FIRST=5):
cnt = [FIRST]
def add_one():
cnt[0] += 1
return cnt[0]
return add_one
num5 = counter(5)
print(num5())
print(num5())
闭包的使用
#计算一次函数 y = a*x + b
#不用闭包的写法
def a_line(a,b,x):
return a*x + b
#采用 lambda 的写法
def a_line(a,b):
return lambda x: a*x + b
line1=a_line(3,5)
print(line1(10))
#用闭包的写法
def a_line(a,b):
def arg_y(x):
return a*x + b
return arg_y
line1 = a_line(3,5)
print(line1(10))
