Documentation officielle de Python

3.4.1 Bit-string Operations on Integer Types

Plain and long integer types support additional operations that make sense only for bit-strings. Negative numbers are treated as their 2's complement value (for long integers, this assumes a sufficiently large number of bits that no overflow occurs during the operation).

The priorities of the binary bit-wise operations are all lower than the numeric operations and higher than the comparisons; the unary operation "~" has the same priority as the other unary numeric operations ("+" and "-").

This table lists the bit-string operations sorted in ascending priority (operations in the same box have the same priority):

Operation	Result	Notes
`x \| y`	bitwise or of `x` and `y`
`x ^ y`	bitwise exclusive or of `x` and `y`
`x & y`	bitwise and of `x` and `y`
`x << n`	`x` shifted left by `n` bits	(1), (2)
`x >> n`	`x` shifted right by `n` bits	(1), (3)
`~x`	the bits of `x` inverted

Notes:

(1): Negative shift counts are illegal and cause a ValueError to be raised.
(2): A left shift by n bits is equivalent to multiplication by pow(2, n) without overflow check.
(3): A right shift by n bits is equivalent to division by pow(2, n) without overflow check.

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