If loop inside of a while loop

[Afterdarkreader]

I have a problem where, I'm trying to use an if loop inside of a while loop to create an array. Its running infinitely.
Anyone see my problem?

import numpy as np

x = np.linspace(1, 100, num = 100)

def append(start, stop, change):
    s = ([])
    x = 0
    while x <= 10:
        if x < start:
            s = np.append(s, 0)
            x = x + 0.01
        elif start <= x <= stop:
            s = np.append(s, change)
            x = x + 0.01
        elif x > stop:
            s = np.append(s, 0)
            x = 0.01
    return s
s = append(3, 7, 0.01)