from physics import *
N = 3.0
x = ones(N)

for i in x:
    x[i] = i * uniform(10)

>>> import random
>>> array = [1]*random.randint(1, 10)
>>> array
[1, 1, 1, 1, 1]
>>> for i, j in enumerate(array):
...     array[i] = j*random.randint(1, 10)
...
>>> array
[3, 7, 5, 1, 2]
>>>

from physics import *
N = 3.0
x = ones(N)

for i in range(len(x)):
    x[i]=i*uniform(10)

import numpy as np
x = np.random.uniform(0, 10, N) * np.arnage(N)

N = 10
x = numpy.ones(N)
x *= numpy.random.uniform(10, size=N)