bin(x)

Returns test

REMARKS

* No prefix required - Core
* Convert an integer number to a binary string prefixed with "0b". The result is a valid Python expression.
* If x is not a Python int object, it has to define an __index__() method that returns an integer.

>>> bin(3) 
'0b11'
>>> bin(-10) 
'-0b1010'

>>> format(14, '#b'), format(14, 'b') 
('0b1110', '1110') 
>>> f'{14:#b}', f'{14:b}' 
('0b1110', '1110')