This library contains data types of fixed bit size and utils for bit manipulations.
It also contains types with support for tri state values etc. (Python equivalents of VHDL std_logic_vector, Verilog wire/reg.)
This may be useful for tools which are simulating hardware or software which needs numbers of exact size.
from pyMathBitPrecise.bits3t import Bits3t
#3t means that bits can have values 1,0,x
uint512_t = Bits3t(512, signed=False)
a = uint512_t.from_py(1)
# indexing on bits
# [note] == is not overloaded, because it would make the values unhashable
# because of support of partially valid values which can not be compared
assert a[0]._eq(1)
assert a[0]._dtype.bit_length() == 1
assert a[1]._eq(0)
assert a[8:]._eq(1)
assert a[8:]._dtype.bit_length() == 8
# arithmetic
b = a + 1
assert b._eq(2)
assert b._dtype == uint512_t
# bitwise operations
c = a >> 8
assert c._eq(0)
assert c._dtype == uint512_t
# casting
d = int(a)
assert d == 1 and isinstance(d, int)
uint8_t = Bits3t(8, signed=False)
e = a.cast(uint8_t)
assert e._dtype == uint8_t