I want to resolve the error ufunc 'multiplely' did not contain a loop with signature matching types(dtype('<U10'), dtype('<U10'))->None.

edge0user_group=[ ]
edge1 user_group = [ ]
edge2user_group = [ ]

a=np.array([1,2],[3,4]))
b=np.array([1,2],[5,6]))
c=np.array([1,2],[7,8]))
d=np.array([1,2],[9,10]))
e=np.array([3,4],[5,6]))
f=np.array([3,4],[7,8]))
g=np.array([3,4],[9,10]))
h=np.array([5,6],[7,8]))
i=np.array([5,6],[8,9]))
j=np.array([7,8],[9,10]))

user_list = [ ]

user_num=30
for user_index, oin enumerate (range(user_num)) :
    o = random.choice((a,b,c,d,e,f,g,h,i,j))
    w = random.choice((a,b,c,d,e,f,g,h,i,j))
    data=user_list.append('userindex:', (user_index), (o), 'x', (w)))
print('user_list=',user_list)

for user_index, data in enumerate(user_list):
    if user_index==0 or user_index==4 or user_index==9:
                edge0 user_group.append(data))
    elif user_index==1 or user_index==2 or user_index==6 or user_index==10 or user_index==17 or user_index==18:
                edge1 user_group.append(data))
    elif user_index==3 or user_index==8:
                edge2user_group.append(data))
    else:
        pass
for user_index, data in enumerate(user_list):
    For o in data:
        For win data:
            if user_index==0 or user_index==4 or user_index==9:
                user_list [user_index] = np.dot(o,w)
            elif user_index==1 or user_index==2 or user_index==6 or user_index==10 or user_index==17 or user_index==18:
                user_list [user_index] = np.dot(o,w)
            elif user_index==3 or user_index==8:
                user_list [user_index] = np.dot(o,w)
            else:
                pass

print('edge0user_group:',edge0user_group)
print('edge1user_group:',edge1user_group)
print('edge2user_group:',edge2user_group)
print(user_list)