Can't create a random list that calculates the longest distance between It's elements

I can't figure out why I'm getting this error: TypeError: 'int' object is not subscriptable*

I'm new to Python so It's difficult for me to track the mistakes I make. I've been trying to figure out what's going on the whole day

User inputs the parameters and creates a random list that calculates the longest distance among its elements.

import random

def generate_random_floats(n,m,seed):
    x = []
    if (y==0):
        random.seed()
        for i in range (n):
            x.append(random.uniform(-m,m))
    else:
        random.seed(y)
        for i in range (n):
            x.append(random.uniform(-m,m))
    return x
    pass
    # function that returns a list of n random numbers in span
    # -m, m with seed generator of random numbers (optional argument)
    
def find_max_gap(x):
    vmin <= x[0]
    dmax = 0
    for i in range (n):
        if (x[i] < vmin):
            vmin = x[i]
        elif (x[i] - vmin > dmax):
            dmax = x[i] - vmin
    return (dmax)
    
    # function that accepts a list of real numbers and returns the maximum distance between them
    pass

def present_list():
    print(" The random list is:",generate_random_floats(n,m,seed))
    # auxiliary function that prints the elements of a list
     pass

n=-1
while n < 0 or n == 0 :
    while True:
        try:
            # user input of how many random numbers
            n = int(input(">>Define the number (n) from the random numbers.\n-Positive number) :"))
            break
        except:
            continue
m=-1
while m < 0 :
    while True:
        try:
            # input user -m, m
            m = int(input(">>Define (range) from which random values will be selected.\n) :"))
            break
        except:
            continue
seed=0
b=0
x=0
s=0
while True:
    try:
        # input seed
        y = int(input("Enter the number that will set the seed value. :"))
        break
    except:
        continue
# create list of random numbers
generate_random_floats(n,m,seed)
present_list()
find_max_gap(x)