如何在python中实现像sum(2)(3)(4)......(n)之类的函数? [英] how to implement a function like sum(2)(3)(4)......(n) in python?

问题描述

如何实现将在python中以以下方式sum_numbers(2)(3)(4)......(n)调用的函数?

how to implement a function that will be invoked in the following way sum_numbers(2)(3)(4)......(n) in python?

结果应为2+3+4+.....+n

我的提示是，由于函数是python中的对象，因此可以使用嵌套函数来实现这些功能，但我不确定.

The hint that I have is since functions are object in pythons there is way to do those using a nested function but I am not sure.

def sum_number(x):
    def sum_number_2(y):
        def sum_number_3(z):
        ....................
            def sum_number_n(n)
                return n
            return sum_number_n
        return sum_number_3
    return sum_number_2
  return sum_number

但是，不用编写太多的嵌套函数，我们应该能够以以下两个调用sum_numbers(2)(3)(4)......(n)

But instead of writing so many nested functions we should be able to do it in couple nested functions to compute sum of n values when invoked in the following way sum_numbers(2)(3)(4)......(n)

推荐答案

使用Python的数据模型功能将结果转换为所需的类型.

Use Python's data model features to convert the result into the desired type.

class sum_number(object):
  def __init__(self, val):
    self.val = val

  def __call__(self, val):
    self.val += val
    return self

  def __float__(self):
    return float(self.val)

  def __int__(self):
    return int(self.val)

print '{}'.format(int(sum_number(2)(3)(8)))
print '{}'.format(float(sum_number(2)(3)(8)))

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