Question

I have a dictionary of string keys and float values.

 mydict = {}
 mydict["joe"] = 20
 mydict["bill"] = 20.232
 mydict["tom"] = 0.0

I want to filter the dictionary to only include pairs that have a value greater than zero.

In C#, I would do something like this:

   dict = dict.Where(r=>r.Value > 0);

What is the equivalent code in Python?

Answer 1

d = dict((k, v) for k, v in d.iteritems() if v > 0)

In Python 2.7 and up, there’s nicer syntax for this:

d = {k: v for k, v in d.items() if v > 0}

Note that this is not strictly a filter because it does create a new dictionary.