Checking That Two Args Are Of Same Type (Posting On Python-List Prohibited)

[Lawrence D'Oliveiro]

Consider a function taking two args “a” and “b”, which can be of str,
bytes or bytearray type, just so long as both are of the same type.
One easy way to test this is

if sum(isinstance(a, t) and isinstance(b, t) for t in (str, bytes, bytearray)) != 1 :
raise TypeError("args must both be str or bytes")
#end if

Actually, both “and’ and “or” will work.

[Keith Thompson]

Lawrence D'Oliveiro <***@nz.invalid> writes:
[snip]

Just curious, why do you add "Posting On Python-List Prohibited" to your
subject lines?

[Paul Rubin]

Post by Lawrence D'Oliveiro
Consider a function taking two args “a” and “b”, which can be of str,
bytes or bytearray type, just so long as both are of the same type.
One easy way to test this is

if type(a)==type(b) and type(a) in (str, bytes, bytearray): ...

[Lawrence D'Oliveiro]

Post by Paul Rubin

Post by Lawrence D'Oliveiro
Consider a function taking two args “a” and “b”, which can be of str,
bytes or bytearray type, just so long as both are of the same type.
One easy way to test this is

if type(a)==type(b) and type(a) in (str, bytes, bytearray): ...

Better to use isinstance instead of direct type comparison.

[Lawrence D'Oliveiro]

Post by Lawrence D'Oliveiro
Actually, both “and’ and “or” will work.

No it won’t. It’ll fail in the case where one or the other arg is of an
entirely different type.