function to calculate Standard Deviation of a list or set of numbers in Python

Standard Deviation σ

Find out the average value (μ ) of the numbers or the list
Find out the sum (Σ) of square of difference between number and average value
Divide the sum by number of elements ( N )
Take the square root of the above division

We will create a Python function to return the Standard Deviation.

import math  list1=[12,13,15,11,9]  def my_stddev(my_list):      my_sum=0      for i in my_list:          my_sum=my_sum+i      #print(my_sum)        my_no=len(my_list)      my_avg=my_sum/my_no      sum_avg=0      for i in my_list:          sum_avg=sum_avg+math.pow((i-my_avg),2)      std=math.sqrt(sum_avg/my_no)      return std      print(my_stddev(list1))

Output