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from cython.cimports.cpython.version import PY_MAJOR_VERSION
@cython.cfunc
def _text(s) -> str:
if type(s) is str:
# Fast path for most common case(s).
return cython.cast(str, s)
elif PY_MAJOR_VERSION < 3 and isinstance(s, bytes):
# Only accept byte strings as text input in Python 2.x, not in Py3.
return cython.cast(bytes, s).decode('ascii')
elif isinstance(s, str):
# We know from the fast path above that 's' can only be a subtype here.
# An evil cast to <str> might still work in some(!) cases,
# depending on what the further processing does. To be safe,
# we can always create a copy instead.
return str(s)
else:
raise TypeError("Could not convert to str.")
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