In Ruby, why does `Array.length` give NoMethodError?

In Python, I can get the length of a rundown by calling its __len__ strategy. __len__ isn't characterized on every individual rundown protest, however on the rundown class. The technique can be gotten to straightforwardly through the class:

>>> [].__len__()

0

>>> type([])

<class 'list'>

>>> list.__len__([])

0

Be that as it may, the comparable code does not work in Ruby:

> [].length

=> 0

> [].class

=> Array

> Array.length([])

NoMethodError: vague strategy `length' for Array:Class

For what reason can the length strategy not be discovered when utilizing Array.length? Does strategy query in Ruby work uniquely in contrast to Python?