Compile time check of Python version

[Nikolaus Rath]

Hello,

I have the following code:

def do_stuff(barf)
cdef char* buf
assert isinstance(barf, str)
if sys.version_info < (3,): # Python 3
barf_bytes = barf.encode('utf-8', 'surrogateescape')
else: # Python 2
barf_bytes = barf
buf = barf_bytes
# ...


However, I really dislike the runtime check on the Python version. In
theory, the condition could already be evaluated at C compile time.

Is there a way to do that? Unfortunately there seem to be no predefined
definitions for sys.version_info like there are for os.uname..


Best,

-Nikolaus

--
»Time flies like an arrow, fruit flies like a Banana.«

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[Stefan Behnel]

Nikolaus Rath, 28.04.2013 22:52:

> I have the following code:
>
> def do_stuff(barf)
> cdef char* buf
> assert isinstance(barf, str)
> if sys.version_info < (3,): # Python 3
> barf_bytes = barf.encode('utf-8', 'surrogateescape')
> else: # Python 2
> barf_bytes = barf
> buf = barf_bytes
> # ...
>
>
> However, I really dislike the runtime check on the Python version. In
> theory, the condition could already be evaluated at C compile time.
>
> Is there a way to do that? Unfortunately there seem to be no predefined
> definitions for sys.version_info like there are for os.uname..

from cpython.version cimport PY_MAJOR_VERSION

if PY_MAJOR_VERSION < 3: ...

Stefan