具有set的循环:键

Question

当对一组int值执行for循环时，我会得到一个密钥错误。

以下是代码：

# groupes : dict[str:set[int]]
groupes = {'cinephiles':{802,125,147,153}, \
'travaux manuels':{125,802,153}, \
'cuisine':{153,147,802}, \
'sport':{153,538,802}}

# This first function helps me for the second one

def proximite_groupes(group, hobby_1, hobby_2):
    """ 
       dict[str:set[int]] * str * str -> float
    """

    # intersection_set : set[int]
    intersection_set = set()
    # union_set : set[int]
    union_set = set()

    # cle : int
    for cle in group[hobby_1]:
        if cle in group[hobby_2]:
            intersection_set.add(cle)


    for cle in group[hobby_1]:
        if cle not in union_set:
            union_set.add(cle)

    for cle in group[hobby_2]:
        if cle not in union_set:
            union_set.add(cle)


    return len(intersection_set) / len(union_set)


def fusion_groupes(group):
    """ 
       dict[str:set[int]] -> dict[str:set[int]]
    """

    # similarite_max : int
    similarite_max = 0.0
    # str_1 : str
    # str_2 : str
    # str_1_final : str
    str_1_final = ''
    str_2_final = ''
    # str_1_final : str
    # str_final : str
    str_final = ' '
    # final_dict : dict[str:set[int]]
    final_dict = group
    # intersection_set : set[int]
    intersection_set = set()

    for str_1 in group:
        for str_2 in group:
            if str_1 != str_2:
                if proximite_groupes(group, str_1, str_2) > similarite_max:
                    similarite_max = proximite_groupes(group, str_1, str_2)
                    str_final = str_1 + '_' + str_2
                    str_1_final = str_1
                    str_2_final = str_2

    del final_dict[str_1_final]
    del final_dict[str_2_final]

    # Creation ensemble union
    for cle in group[str_1_final]:
        if cle in group[str_2_final]:
            intersection_set.add(cle)

    final_dict[str_final] = intersection_set

    return final_dict

函数的目的有点难，但我这里的问题是：

File "<input>", line 1, in <module>
  File "<input>", line 261, in fusion_groupes (note that the line would not be the same for you because my program has more lines)
KeyError: 'cuisine' 

(但有一次是“美食”，另一次是“恋童癖”，或“运动”，.

Answer 1

我在这些线上的两美分就是罪魁祸首。

final_dict = group del final_dict[str_1_final] del final_dict[str_2_final]。

这与python没有将名为group的字典深入复制到final_dict这一事实有关。相反，final_dict只是在引用组。因此，当您从final_dict中删除密钥时，它也会从组中删除。下面的代码是：

for cle in group[str_1_final]:。

失败了。

下面是发生的事情的示例：https://trinket.io/python/64f20460d9