Seperate array into three new arrays using inequalities in Python

I am trying to split an array into three new arrays using inequalities.

This will give you an idea of what I am trying to achieve:

measurement = [1, 5, 10, 13, 40, 43, 60]

for x in measurement:
    if 0 < x < 6:
        small = measurement
    elif 6 < x < 15:
        medium = measurement
    else
        large = measurement

Intended Output:

small = [1, 5]
medium = [10, 13]
large = [40, 43, 60]

You can use numpy:

arr = np.array(measurement)     
small = arr[(arr>0)&(arr<6)]    # array([1, 5])
medium = arr[(arr>6)&(arr<15)]  # array([10, 13])
large = arr[(arr>15)]           # array([40, 43, 60])

You can also use dictionary:

d = {'small':[], 'medium':[], 'large':[]}
for x in measurement:
    if 0 < x < 6:
        d['small'].append(x)
    elif 6 < x < 15:
        d['medium'].append(x)
    else:
        d['large'].append(x)

Output:

{'small': [1, 5], 'medium': [10, 13], 'large': [40, 43, 60]}