Python学习笔记——利用闭包写递增函数

*前言：这篇算是一个总结笔记

利用闭包返回一个计数器函数，每次调用它返回递增整数：

• 创建生成器：

def createCounter():
    def f():
        x = 0
        while True:
            x += 1
            yield x
    it = f()

    def number():
        return next(it)
    return number

createA = createCounter()
print(createA())

• 列表

  def createCounter():
  	f = [0]
  	def increase():
  		f[0] = f[0] + 1
  		return f[0]
  	return increase
  
  createA = createCounter()
  print(createA())
  print(createA())
  print(createA())