检查python列表列表中列表的存在

Question

I need to check the presence of a list in list of lists. The problem that i face is that my list is composed of class objects and therefore i am not able to do this using the normal "if list in list_of_lists" method

the relevant part of my code is as follows

for ind in feasible_pop_comp:
    for other in feasible_pop_comp:
        if ind.Type!= other.Type:
            comp=[ind,other]
            if comp not in self.candidate.list #does not work even with .any() or .all() included
                dombool=self.compare_typematch(ind, other)
                if (dombool==0):
                    replace=self.check_distance(ind.point,other.point)
                    if replace:
                        if(ind<other):
                            feasible_pop_comp.remove(other)
                        else:
                            feasible_pop_comp.remove(ind)
                else:
                    self.candidate_list.append(comp)

My class already has inbuilt commands to check structural similarities with other class objects(read equality)

def __eq__(self, other): 
    return self.point == other.point# as all other parameters are derived from analysing the point, this equivalence is sufficient

Traceback is as follows:

if comp not in self.candidate_list:
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Failed !

it loop enters for the first time when the self.candidate_list is empty

As you might notice from my unpythonic code, I am relatively new to python. Thanks in Advance.

Answer 1

Have you tried overriding the __contains__ method for your container class? That way you could get the in operator to work.

But after all, I'm not really sure whether I did understand all parts of your problem...