Without the 0x prefix, you need to specify the base explicitly, otherwise there’s no way to tell:
x = int("deadbeef", 16)
With the 0x prefix, Python can distinguish hex and decimal automatically.
>>> print(int("0xdeadbeef", 0))
3735928559
>>> print(int("10", 0))
10
(You must specify 0
as the base in order to invoke this prefix-guessing behavior; if you omit the second parameter int()
will assume base-10.)
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