TypeError: 'int' object does not support item assignment

I try to get the solution
class Solution:
    ObjVal = 0
    X = [[[]]]
    Y = [[[[]]]]
    C = [[]]
    Ct = [[]]
    Vl = [[[]]]
    Vr = [[[]]]
    T = [[[]]]
    t = [[[[]]]]
    route_Truck = []
    route_UAV = []

    def getSolution(self, data, model):
        solution = Solution()
        solution.ObjVal = model.ObjVal
        # X_ijk
        solution.X = [[([0] * data.vehicleNum) for j in range(data.nodeNum)] for i in range(data.nodeNum)]
        # Y_ijkd
        solution.Y = [[([0] * data.nodeNum) for j in range(data.nodeNum)] for k in range(data.vehicleNum) for d in range(data.droneNum)]
        # C_ik, C_id
        solution.C = [([0] * data.vehicleNum) for i in range(data.nodeNum)]
        solution.Ct = [([0] * data.droneNum) for i in range(data.nodeNum)]
        # Vl, Vr
        solution.Vl = [[([0] * data.droneNum) for k in range(data.vehicleNum)] for i in range(data.nodeNum)]
        solution.Vr = [[([0] * data.droneNum) for k in range(data.vehicleNum)] for i in range(data.nodeNum)]
        # T_ijk, t_ijkd
        solution.T = [[([0] * data.vehicleNum) for j in range(data.nodeNum)] for i in range(data.nodeNum)]
        solution.t = [[([0] * data.droneNum) for k in range(data.vehicleNum)] for j in range(data.nodeNum) for i in range(data.nodeNum)]

        for m in model.getVars():
            str = re.split(r"_", m.VarName)
            if (str[0] == "X" and m.x == 1):
                solution.X[int(str[1])][int(str[2])][int(str[3])] = m.x
                print(str, end="")
                print(" = %d" % m.x)
            elif (str[0] == "Y" and m.x == 1):
                solution.Y[int(str[1])][int(str[2])][int(str[3])][int(str[4])] = m.x
            elif (str[0] == "C" and m.x == 1):
                solution.C[int(str[1])][int(str[2])] = m.x
            elif (str[0] == "Ct" and m.x == 1):
                solution.Ct[int(str[1])][int(str[2])] = m.x
            elif (str[0] == "Vl" and m.x == 1):
                solution.Vl[int(str[1])][int(str[2])][int(str[3])] = m.x
            elif (str[0] == "Vr" and m.x == 1):
                solution.Vr[int(str[1])][int(str[2])][int(str[3])] = m.x
            elif (str[0] == "T" and m.x > 0):
                solution.T[int(str[1])][int(str[2])][int(str[3])] = m.x
            elif (str[0] == "t" and m.x > 0):
                solution.t[int(str[1])][int(str[2])][int(str[3])][int(str[4])] = m.x
            elif (str[0] == "z" and m.x > 0):
                solution.z = m.x

solution.Y reports the error:
Traceback (most recent call last):
  File "E:/PycharmProjects/project/gurobi.py", line 560, in <module>
    solution = solution.getSolution(data, model)
  File "E:/PycharmProjects/project/gurobi.py", line 126, in getSolution
    solution.Y[int(str[1])][int(str[2])][int(str[3])][int(str[4])] = m.x
TypeError: 'int' object does not support item assignment