Python program to calculate standard deviation; Through this tutorial, i am going to show you how to find or calculate standard deviation in python.

In this tutorial, i will write a program to compute standard deviation in python.

**Python Program to Find Standard Deviation**

See the following python programs to standard deviation; as shown below:

- Write a program to calculate standard deviation in python.
- How to find standard deviation in python without inbuilt function.

### Write a program to calculate standard deviation in python

# import statistics library import statistics print(statistics.stdev([1,2,3,4,5,5,5,6,7,8])) print(statistics.stdev([40,45,35,10,15,18,12,16], 45))

**Output**

2.1705094128132942 13.829962297231946

Note:- `stdev()`

function in python is the Standard statistics Library of Python Programming Language. The use of this function is to calculate the standard deviation of given continuous numeric data.

### How to find standard deviation in python without inbuilt function

#define a function, to calculate standard deviation def stdv(X): mean = sum(X)/len(X) tot = 0.0 for x in X: tot = tot + (x - mean)**2 return (tot/len(X))**0.5 # call function with following data set x = [1, 2, 3, 4, 5, 6, 7, 8] print("Standard Deviation is: ", stdv(x)) y = [1, 2, 3, -4, -5, -6, -7, -8] print("Standard Deviation is: ", stdv(y)) z = [10, -20, 30, -40, 50, 60, -70, 80] print("Standard Deviation is: ", stdv(z))

**Output**

Standard Deviation is: 2.29128784747792 Standard Deviation is: 4.06201920231798 Standard Deviation is: 48.925964476952316

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