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了解这个 Python 装饰器的工作原理

我一直在研究如何创建自己的装饰器，并给出了以下示例：

def counter(func):
  def wrapper(*args, **kwargs):
    wrapper.count += 1
    # Call the function being decorated and return the result
    return wrapper.count
  wrapper.count = 0
  # Return the new decorated function
  return wrapper

# Decorate foo() with the counter() decorator
@counter
def foo():
  print('calling foo()')
  
foo()
foo()

print('foo() was called {} times.'.format(foo.count))

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我不明白那段代码的逻辑。