MongoDB KeyError, No JSON object could be decoded

Question

I have a query in MongoDB using Python:

for car in cars.find({"year": "2014"}):
    print car['V8']

The problem is, not every record has V8 entry exists. It will pop up error:

KeyError: 'V8'

No JSON object could be decoded

How can I ignore the error and just print empty string if the Key is not exist?

reptilicus · Accepted Answer · 2014-11-10 18:51:42Z

1

This looks like python, if so you can do

print car.get("V8", "")

edited Nov 10, 2014 at 18:51

answered Nov 10, 2014 at 18:33

reptilicus

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2 Comments

sbs Over a year ago

Thanks for the answer, it will return None. And when I concatenate the result to some other string, it shows error "TypeError: coercing to Unicode: need string or buffer, NoneType found". Is there a workaround?

reptilicus Over a year ago

Edited. Try that, the second param to get() is what is returned when the key is not found

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