standard deviation in pure python in python

Standard deviation is a measure of the amount of variation or dispersion of a set of values around its mean. In Python, we can use the statistics module to easily calculate the standard deviation of a list of values. Here's an example code:

main.py
import statistics

# create a list of values
data = [1, 2, 3, 4, 5]

# calculate the population standard deviation
std_dev = statistics.pstdev(data)

print("Population Standard Deviation:", std_dev)

# calculate the sample standard deviation
sample_std_dev = statistics.stdev(data)

print("Sample Standard Deviation:", sample_std_dev)
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In the example code above, we first import the statistics module. We then create a list of numbers data. We use pstdev() to calculate the population standard deviation and stdev() to calculate the sample standard deviation.

Note that pstdev() calculates the population standard deviation, which assumes that the given data represents the entire population, while stdev() calculates the sample standard deviation, which assumes that the given data is a random sample from a larger population.