find the variance of all keys in a map in python

To find the variance of all the keys in a Python dictionary (or map), you can use the statistics and math modules. Here's an example code snippet:

main.py
import statistics
import math

# Example dictionary
my_dict = {"key1": 5, "key2": 10, "key3": 15}

# Calculate variance of dictionary keys
keys = list(my_dict.keys())
mean = sum(keys) / len(keys)
variance = statistics.variance(keys, mean)

print("Variance of dictionary keys:", variance)
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In this code, we first import the statistics and math modules. We then define an example dictionary my_dict. The list() function is used to turn the dictionary keys into a list, which we can then use in the variance() function from the statistics module.

Note that the variance() function requires that you provide the mean value of the data in order to calculate the variance. We calculate this mean value using the sum() and len() functions, and store it in the mean variable.

Finally, we use the print() function to print out the variance of the dictionary keys.