CODEWITHSUNDEEP
pythondictionary
Tim
Tim

Reputation: 99428

Apply functions to values of dictionaries

I have a list L of dictionaries, where the dictionaries have the same set of keys.

I have another dictionary d, which also has the same set of keys as the previous dictionaries.

For each key in the set of keys, d[key] is a function which can apply to L[i][key], i.e. d[key](L[i][key]).

I want to reset the values of dictionaries in L, using the functions in the values of d, i.e. 

L[i][key] = d[key](L[i][key])

for all key and all i.

How can I do it in a more pythonic way? Thanks.

E.g. 

d = {'a':int, 'b':myfun, 'c':yourfun}

L[1] = {'a':`10`, 'b':5, 'c':1.4}

where int is a type conversion function int(), myfun is a function which can take an integer as its argument, and yourfun is another function which can take a floating number as its argument.

Upvotes: 2

Views: 1166

Answers (1)

Xymostech
Xymostech

Reputation: 9850

You can regenerate L with the correct values using a list and dict comprehension:

L = [{k: d[k](v) for (k, v) in l.iteritems()} for l in L]

Upvotes: 5

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