Loop through dictionary and change values

Question

Lets say I have a dictionary with names and grades:

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{"Tom" : 65, "Bob" : 90, "John" : 80...}

and I want to take all the values in the dictionary and add 10% to each:

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{"Tom" : 71.5, "Bob" : 99, "John" : 88...}

How can I do it through all the values in the dictionary?

Answer 1

Dict comprehension:

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mydict = {key:value*1.10 for key, value in mydict.items()}

Pre 2.7 :

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mydict = dict(((key, value*1.10) for key, value in mydict.items()))