CODEWITHSUNDEEP
pythondictionary
Intrastellar Explorer
Intrastellar Explorer

Reputation: 2381

Python dictionaries - difference between dict.get(key) and dict.get(key, {})

When getting values from a dictionary, I have seen people use two methods:

dict.get(key)

dict.get(key, {})

They seem to do the same thing. What is the difference, and which is the more standard method?

Thank you in advance!

Upvotes: 0

Views: 803

Answers (2)

Eric Wilson
Eric Wilson

Reputation: 59335

From the documentation:

get(key[, default]) Return the value for key if key is in the dictionary, else default. If default is not given, it defaults to None, so that this method never raises a KeyError.

The typical way to look things up in a dictionary is d[key], which will raise KeyError when the key is not present.

When you don't want to search for documentation, you can do:

d = {}
help(d.get)

which will display the docstring for the the get method for dictionary d.

Upvotes: 2

Draconis
Draconis

Reputation: 3461

The second parameter to dict.get is optional: it's what's returned if the key isn't found. If you don't supply it, it will return None.

So:

>>> d = {'a':1, 'b':2}
>>> d.get('c')
None
>>> d.get('c', {})
{}

Upvotes: 7

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