Pymongo $size operator

Is $size equivalent operator for query condition in pymongo?

like {'a'开发者_Python百科: {'$size': 3}}

for {a: [1,2,3]}

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I don't quite understand your question, but if you're asking if db.foo.find({a: {$size: 3}}) would return the document {a: [1, 2, 3]}, then the answer is yes.