使用继承时 init() 中的参数数量问题

Question

我是一个尝试使用 Python 执行继承的初学者。所以我决定练习 Michael T. Goodrich "Data Structures and Algorithms in Python" 一书中的示例程序。

代码如下：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-


class Progression:
    def __init__(self,start=0):
        self._current = start

    def _advanced(self):
        self._current += 1

    def __next__(self):
        if self._current is None:
            raise StopIteration()
        else:
            answer = self._current
            self._advanced()
            return answer

    def __iter__(self):
        return self

    def print_progression(self,n):
        print(' '.join(str(next(self)) for j in range(n)))


class ArithmeticProgression:
    def __init__(self,increment=1,start=0):
        super().__init__(start)
        self._increment = increment

    def _advance(self):
        self._current += self._increment

class GeometricProgression(Progression):

    def __init__(self,base=2,start=1):
        super().__init__(start)
        self._base = base

    def _advance(self):
        self._current *= self._base

class FibonacciProgression(Progression):
    def __init__(self,first=0,second=1):
        super().__init__(first)
        self._prev = second - first

    def _advance(self):
        self._prev, self._current = self._current,self._prev + self._current

if __name__ == '__main__':
    print('Default Progression: ')
    Progression().print_progression(10)

    print('Arithmetic progression with increment 5 and start 2:')
    ArithmeticProgression(5,2).print_progression(10)

    print('Geometric progression with default base:')
    GeometricProgression().print_progression(10)

    print('Geometric progression with increasing it to the power of 2')
    GeometricProgression(3).print_progression(10)

    print('Fibonacci progression with default start progression')
    FibonacciProgression().print_progression(10)

    print('Fibonacci progression with default start progression')
    FibonacciProgression(4,6).print_progression(10)

这里是错误：

Default Progression: 
0 1 2 3 4 5 6 7 8 9
Arithmetic progression with increment 5 and start 2:
Traceback (most recent call last):

  File "some location", line 61, in <module>
    ArithmeticProgression(5,2).print_progression(10)

  File "some location", line 33, in __init__
    super().__init__(start)

TypeError: object.__init__() takes exactly one argument (the instance to initialize)

如有任何帮助，我们将不胜感激。在这里，我试图检查 ArithmeticProgression 的 super().init(start) 但我对 init( ）例子。任何帮助将不胜感激。我也是初学者

Answer 1

ArithmeticProgression 不像 GeometricProgression 那样继承自 Progression。所以没有基础 class 可以调用 super().

替换 class ArithmeticProgression(Progression): 和 class ArithmeticProgression:

简而言之：你只是忘记了(Progression)

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