Way for see if dict has a key

[Fredrik Lundh]

Michele Petrazzo wrote:

>> Michele Petrazzo wrote:
>>
>>>>> key in dict
>>>> new syntax (2.3 and later).
>>> So, following it, it can be used for the operations like len?
>>
>> what's "it" in this sentence?
>
> It, is the thought that the new 2.3 introduce.

support for "key in dictionary" form was added in 2.3 (in earlier versions,
"in" was only supported for sequences, not for mappings).

len(dictionary) works in all Python versions.

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