How to find a specific index of some values in list Python

I have a function called ModelsProduct in which I am generating all possible combinations of "+/-" and "a,b,c,d,e". In the below code #producemodelsOne

modelsStepOne selects the all 8 combinations of +/-

modelsStepTwo selects the first value of list i-e a

modelsStepThree selects its first value of list i-e ('a','a')

modelsStepFour selects its first value of list i-e ('d','d')

modelsStepFive selects its first value of list i-e ('e','e')

which makes a combination of [+,+,+,+,+,+,+,+,a,a,a,d,d,e,e] and iterates so on for all possible combinations.

Following is the Output when you print it.

print (modelsOne[0])
print (modelsOne[1])

('+', '+', '+', '+', '+', '+', '+', '+', 'a', 'a', 'a', 'd', 'd', 'e', 'e')

('+', '+', '+', '+', '+', '+', '+', '+', 'a', 'a', 'a', 'd', 'e', 'e', 'e')

Question How to find a specific index value in all possible combinations e.g What will be the index value of possible combination [+,-,+,+,+,+,-,-,a,a,b,c,c,e,c] ?

Here is the code for making all possible combinations

def ModelsProduct(modelsOne, modelsTwo, modelsThree, modelsFour,modelsFive):

modelsStepOne = list(product("+-",repeat = 8)) ## It gives total 12288 model combinations
modelsStepThree = [('a','a'),('a','b'),('a','c'),('a','d'),('a','e'),('b','b'),('b','c'),('b','d'),('b','e'),('c','c'),('c','d'),('c','e')]
modelsStepFour = [('d','d'),('d','e')]
modelsStepFive = [('e','e')]



#produce modelsOne
modelsStepTwo = [('a',),('b',)]
for one in modelsStepOne:
    for two in modelsStepTwo:
        for three in modelsStepThree:
            for four in modelsStepFour:
                for five in modelsStepFive:
                    modelsOne.append(one+two+three+four+five)


#produce modelsTwo
modelsStepTwo = [('a',),('b',)]
for one in modelsStepOne:
    for two in modelsStepTwo:
        for three in modelsStepThree:
            for four in modelsStepFour:
                for five in modelsStepFive:
                    modelsTwo.append(one+two+three+four+five)


#produce modelsThree
modelsStepTwo = [('a',),('b',)]
for one in modelsStepOne:
    for two in modelsStepTwo:
        for three in modelsStepThree:
            for four in modelsStepFour:
                for five in modelsStepFive:
                    modelsThree.append(one+two+three+four+five)

#ModelsFour
modelsStepTwo = [('a',),('d',)]
for one in modelsStepOne:
    for two in modelsStepTwo:
        for three in modelsStepThree:
            for four in modelsStepFour:
                for five in modelsStepFive:
                    modelsFour.append(one+two+three+four+five)

 #ModelsFive
modelsStepTwo = [('a',),('e',)]
for one in modelsStepOne:
    for two in modelsStepTwo:
        for three in modelsStepThree:
            for four in modelsStepFour:
                for five in modelsStepFive:
                    modelsFive.append(one+two+three+four+five)

 return modelsOne, modelsTwo, modelsThree, modelsFour, modelsFive

modelsOne, modelsTwo,modelsThree, modelsFour,modelsFive = ModelsProduct(modelsOne, modelsTwo, modelsThree, modelsFour, modelsFive)