That was done for int.bit_length() and int.bit_count(). There’s no consistent “logic” to this. At heart, Python is not, and does not aspire to be, a purely OO language. There are centuries of literature and prior art that “spell” the high-use integer functions (like gcd(), factorial(), etc) in some form of functional notation. object.method() notation is a new-fangled thing and not necessarily an improvement for usability 
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