2.3.4.1 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):
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.
|
