Question

我是python的新手，我正在打字写一个类＆＃34;＆＃34; specialList＆＃34;＆＃34;。 SpecialList是一个具有两个实例变量的类，value_list和size，value_list引用一个列表，size存储一个整数，表示可以存储在列表中的最大项目数。
这是我到目前为止所做的：

class SpecialList:
"""A list that can hold a limited number of items."""

    def __init__(self, size):
    """ (SpecialList, int)
    >>> L = SpecialList(10)
    >>> L.size
    10
    >>> L.value_list
    []
    """
    # complete this code





    def push_value(self, new_value):
    """ (SpecialList, object) -> NoneType

    Append new_value to this list, if there is enough space in the list according to its maximum size.  
    If there is insufficient space, new_value should not be added to the list.

    >>> L = SpecialList(10)
    >>> L.push_value(3)
    >>> L.value_list
    [3]
    """
    # complete this code



    def pop_most_recent_value(self):
    """ (SpecialList) -> object

    Precondition: len(self.value_list) != 0

    Return the value added most recently to value_list and remove it from the list.

    >>> L = SpecialList(10)
    >>> L.push_value(3)
    >>> L.push_value(4)
    >>> L.value_list
    [3, 4]
    >>> L.pop_most_recent_value()
    4
    """
    # complete this code



    def compar(self, other):
    """ (SpecialList, SpecialList) -> int
    Return 0 if both SpecialList objects have lists of the same size.
    Return 1 if self's list contains more items than other's list.
    Return -1 if self's list contains fewer items than other's list.



    """
    # complete this code
    self.other = []

    if range(len(self.value_list)) == range(len(self.other)):
        return 0
    elif range(len(self.value_list)) > len(self.other):
        return 1
    else:
        return -1

一切正常，但最后一部分，def比较，我没有得到正确的分数.. 请帮忙

Answer 1

对compare方法进行一些修改：

摆脱范围。
摆脱self.other = []
other是SpecialList的一个实例。所以你需要比较self＆＃39; s value_list和other s＆＃39; value_list。

试试这个：

if len(self.value_list) == len(other.value_list):
    return 0
elif len(self.value_list) > len(other.value_list):
    return 1
else:
    return -1

python写类特别列表

1 个答案: