Question

I want to iterate a dictionary, examine the value and delete items that matches certain values.

Example

d = {1, 1, 2, 1, 4, 5}   
for i in d:
  if i == 1:
    del i

But we know doing this is dangerous since the list is updated while it is been iterated. What is clean way of doing this in Python?

Answer 1

If k is your dictionary, you can do

k = {x:v for x,v in k.iteritems() if x != 1}

For 2.7+ and 3.0

For anything older, you can do

k = dict((x,v) for x,v in k.iteritems() if x!=1)