Python len() function

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The len() function counts the number of items in an object.

Its syntax is as follows:

obj obj can be a string, list, dictionary, tuple etc.

Here is an example:

Ironically, the len() function doesn’t work with a generator. Trying to call len() on a generator object will result in TypeError exception.

len() with User defined objects

To use len() on user-defined objects you will have to implement the __len__()  method.


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