How I can get rid of None values in dictionary?

Question

Something like:

for (a,b) in kwargs.iteritems():
    if not b : del kwargs[a]

This code raise exception because changing of dictionary when

Answer 1

The recursive approach to also filter nested lists of dicts in the dictionary:

def filter_none(d):
if isinstance(d, dict):
    return {k: filter_none(v) for k, v in d.items() if v is not None}
elif isinstance(d, list):
    return [filter_none(v) for v in d]
else:
    return d

Sample output:

data = {'a': 'b', 'c': None, 'd':{'e': 'f', 'h': None, 'i':[{'j': 'k', 'l': None}]}}
print(filter_none(data))
>>> {'a': 'b', 'd': {'e': 'f', 'i': [{'j': 'k'}]}}