Python code not working properly

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I've made a code to calculate the resistance in a circuit. It considers each change between 'in series' and 'in parallel' to be a 'part', then is given the number of parts, number of resistors for each part, and resistance of each resistor.

def resistance():
    p = int(input('Enter number of parts. One "part" is a resistor or sequence of resistors that are in parallel while the rest are in series, or vice versa.'))
    for x in range(1, p):
        n = input('Enter number of resistors in part' + x)
        for y in range(1, n):
            w = input('Enter the resistance of resistor #' + y)
            q.append(w)
        t = str(input('In series or parallel? Enter S for series, P for parallel.'))
        if t == 'S':
            for z in range(1, len(q)):
                s += q[z-1]
        elif t == 'P':
            for v in range(1, len(q)):
                s += (1/q[z-1])
        q = []
    return s

The problem is, whenever I run it, it takes in 'p', then gives the following error:

local variable 's' referenced before assignment

When I set s = 0 before the first loop, it just takes in 'p' then returns 0.

Can anyone tell me where this is going wrong?

asked 6 secs ago

user3397827

11