# cython: language_level=2 does not work as expected

[jdemeyer]

There seems to be a problem with handling # cython: language_level=2 when language_level=3str is set globally (for example, using the compiler_directives flag of cythonize()).

For some features like division, the Python 3 semantics are used anyway.

Example:

# cython: language_level=2
def test():
    ver = 3
    L = [ver for ver in [2]]
    print(f"effective language_level for list comprehension: {ver}")

    cdef object a = 3
    ver = int((a / 2) * 2)
    print(f"effective language_level for division: {ver}")

gives as output

>>> test()
effective language_level for list comprehension: 2
effective language_level for division: 3

Strangely enough, the opposite (# cython: language_level=3str when language_level=2 is set globally) works correctly.

[jdemeyer]

The problems seems to be that set_language_level only adds future_directives but it never removes any.

[jdemeyer]

PR coming...