Populating a list/array by index in Python?

Question

Is this possible:

myList = []

myList[12] = \'a\'
myList[22] = \'b\'
myList[32] = \'c\'
myList[42] = \'d\'

When I try, I get:

#         


        

Answer 1

Just in case someone needs, I figured out a soluction for my problem, I needed to calc a lot of factorials, some of them could be repeated, so here is my solution:

factorials = {}

def calcFact(v):
    try:
        return factorials[v]
    except KeyError:
        factorials[v] = math.factorial(v)
        return factorials[v]

Testcase:

calcFact(99000)
calcFact(90900)
calcFact(90090)
calcFact(90009)
calcFact(90009) #repeated
calcFact(90009) #repeated

Results:

Repeating mathematical calc: 1.576 s

Using the above code (a list to store repeated values): 1.011 s