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General Tech QA/Testing 2 years ago
Posted on 16 Aug 2022, this text provides information on QA/Testing related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I wanted to test if a key exists in a dictionary before updating the value for the key. I wrote the following code:
if 'key1' in dict.keys(): print "blah" else: print "boo"
I think this is not the best way to accomplish this task. Is there a better way to test for a key in the dictionary?
in is the intended way to test for the existence of a key in a dict.
in
dict
d = dict() for i in xrange(100): key = i % 10 if key in d: d[key] += 1 else: d[key] = 1
If you wanted a default, you can always use dict.get():
dict.get()
d = dict() for i in xrange(100): key = i % 10 d[key] = d.get(key, 0) + 1
... and if you wanted to always ensure a default value for any key you can use defaultdict from the collections module, like so:
defaultdict
collections
from collections import defaultdict d = defaultdict(lambda: 0) for i in xrange(100): d[i % 10] += 1
... but in general, the in keyword is the best way to do it.
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