How can I iterate over and modify the values in a dict?

Question

records = {'foo':foo, 'bar':bar, 'baz':baz} 

I want to change the values to 0 if it is None. How can I do this?

eg:

records = {'foo':None, 'bar':None, 'baz':1} 

I want to change foo and bar to 0. Final dict:

records = {'foo':0, 'bar':0, 'baz':1} 

Answer 1

for k in records:     if records[k] is None:         records[k] = 0 

Answer 2

Another way

records.update((k, 0) for k,v in records.iteritems() if v is None) 

Example

>>> records {'bar': None, 'baz': 1, 'foo': None} >>> records.update((k, 0) for k,v in records.iteritems() if v is None) >>> records {'bar': 0, 'baz': 1, 'foo': 0}