Antony Lee <[email protected]> added the comment:
To be honest, I don't really remember what exact use case I had in my mind 2
years ago (as I probably worked around it in one way or another). However, one
example that I can think of (and that I have actually implemented before) is
auto-conversion of C #defines from a C header file to a Python-level enum (e.g.
for semi-automatic generation of a ctypes wrapper):
# A general header parser (untested, just an example)
def parse_defines(header_file):
d = {}
for line in header_file:
if line.startswith("#define"):
_, k, v = line.split()
d[k] = int(v)
return d
# Now wrapping a specific C library
foo_defines = parse_defines("foo.h")
class Foo(Enum):
locals().update({k: v for k, v in foo_defines.items() if
k.startswith("FOO_")})
def some_method(self):
...
# e.g. call a C function that takes a FOO_* as parameter.
Obviously I could always just replace the method by a free function, but that's
true for (nearly) all methods. In other words, it seems a bit "unfair" that it
is easy to define methods on enums where all options are explicitly listed, but
very hard(?) to do so on enums with programatically defined options.
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Python tracker <[email protected]>
<https://bugs.python.org/issue34750>
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