Reading from Python dict if key might not be present

Question

I am very new to Python and parsing data.

I can pull an external JSON feed into a Python dictionary and iterate over the dictionary.

for r in results:
         


        

Answer 1

[Updated to remove careless mistake]

You could also do something like this:

for r in (row for row in results if 'a' in row):
    print r['a']

This uses a generator expression to pick "rows" out of "results" where "row" includes the key "a".

Here's a little test script:

results = [{'a':True}, {'b':True}, {'a':True}]
for r in (row for row in results if 'a' in row): print r['a']