k I'm trying to create a program that calculates the Standard deviation of a sample of r random numbers between 0 and 1 in python 2.7.

This is my program:

```
from random import random
r= input("please enter a number r: ")
for i in range(r):
sum1=0
i = random()
sum1 += i
a= (sum1 / r*1.0)
# this computes average of random numbers between 0 and 1
def SD():
L = []
for r in range(i):
if r[i] > a:
L.append((r[i] - a)**2)
if r[i] < a:
L.append((a - r[i])**2)
SD = (float(L)/r)**0.5
return SD
print "The standard deviation is", SD
```

It gives me a value but I would like to know for sure if this program is correct? Thanks!