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I have to find the average of a list in Python. This is my code so far
from functools import reduce l = [15, 18, 2, 36, 12, 78, 5, 6, 9] print(reduce(lambda x, y: x + y, l)) I've got it so it adds together the values in the list, but I don't know how to make it divide into them?
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Summary: The formula to calculate average is done by calculating the sum of the numbers in the list divided by the count of numbers in the list.
There are two ways to find the average of a list of numbers in Python. You can divide the sum() by the len() of a list of numbers to find the average. Or, you can find the average of a list using the Python mean() function. Finding the average of a set of values is a common task in Python.
In Python we can find the average of a list by simply using the sum() and len() function.
Step 1: input “size of the list” Step 2: input “Element” Step 3: using sum function calculate summation of all numbers. Step 4: calculate average.
On Python 3.8+, with floats, you can use statistics.fmean as it's faster with floats.
On Python 3.4+, you can use statistics.mean:
l = [15, 18, 2, 36, 12, 78, 5, 6, 9] import statistics statistics.mean(l) # = 20.11111111111111 On older versions of Python you can:
sum(l) / len(l) On Python 2, you need to convert len to a float to get float division
sum(l) / float(len(l)) There is no need to use functools.reduce as it is much slower.
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l = [15, 18, 2, 36, 12, 78, 5, 6, 9] sum(l) / len(l) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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