﻿ Python Math: Calculate the standard deviation - w3resource

# Python Math: Calculate the standard deviation

## Python Math: Exercise-57 with Solution

Write a Python program to calculate the standard deviation of the following data.

Sample Solution:-

Python Code:

``````import math
import sys

def sd_calc(data):
n = len(data)

if n <= 1:
return 0.0

mean, sd = avg_calc(data), 0.0

# calculate stan. dev.
for el in data:
sd += (float(el) - mean)**2
sd = math.sqrt(sd / float(n-1))

return sd

def avg_calc(ls):
n, mean = len(ls), 0.0

if n <= 1:
return ls[0]

# calculate average
for el in ls:
mean = mean + float(el)
mean = mean / float(n)

return mean

data = [4, 2, 5, 8, 6]
print("Sample Data: ",data)
print("Standard Deviation : ",sd_calc(data))
```
```

Sample Output:

```Sample Data:  [4, 2, 5, 8, 6]
Standard Deviation :  2.23606797749979
```

Pictorial Presentation:

Flowchart:

Python Code Editor:

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## Python: Tips of the Day

Getting rid of unwanted characters:

You can get rid of whitespaces or any specific character using strip methods in Python. You can use either plain strip for both sides, lstrip for the left side and rstrip for the right side only.

```str="+++Welcome python+++"
str.strip()

print(str)```

Output:

`+++Welcome python+++`