python filter a dictionary by keys or values

filter_dict.py

d = {1:11, 2:22, 3:33}

# filter by key
d2 = {k : v for k,v in filter(lambda t: t[0] in [1, 3], d.iteritems())}

# filter by value
d3 = {k : v for k,v in d.iteritems() if k in [2,3]}

shouldn't the if k in [2,3] be a v not a k on line 7 if filtering by value?

It's actually not filtering by keys or by values, @Lane012. I think he meant that you can either filter before iterating in for (using filter), or after iterating in for, using the 'if'.

>>> d = {1:11, 2:22, 3:33}
>>> d
{1: 11, 2: 22, 3: 33}
>>> d.iteritems()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'dict' object has no attribute 'iteritems'
>>>

@fbens iteritems is gone if you're using python 3. try d.items() instead

can use this for value search
d3 = {k : v for k,v in filter(lambda t: t[1] in [22, 33], d.iteritems())}