find standard deviation of array python

# Python3 code to demonstrate working of 
# Standard deviation of list 
# Using sum() + list comprehension 
  
# initializing list 
test_list = [4, 5, 8, 9, 10] 
  
# printing list 
print("The original list : " + str(test_list)) 
  
# Standard deviation of list 
# Using sum() + list comprehension 
mean = sum(test_list) / len(test_list) 
variance = sum([((x - mean) ** 2) for x in test_list]) / len(test_list) 
res = variance ** 0.5
  
# Printing result 
print("Standard deviation of sample is : " + str(res))