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pythondictionary-comprehension

Dictonary comphrension of another dictonary to calcualte average of list values

I have a dictonary like -

d = {'a': [1, 2, 3], 'b': [4, 9], 'c': [1, 3, 9, 8]...}

I want to have a new dictonary which will be

r = {'a': 2, 'b': 6.5, 'c': 5.25}

which are average of list items. I want to do that in a dictonary comprehension code.

Solution 
  • r = {
     k: sum(v) / len(v) 
     for (k, v) in d.items()
}
# {'a': 2.0, 'b': 6.5, 'c': 5.25}