exception - Handle c library error in python? -


if i'm using lib written in c in python, such zlib, , error like:

error: error -3 while decompressing: invalid distance far

how handle exception python? presumably exception defined in c module , there no exception class catch on except someexception?

to call c function python, c function must wrapped python function. cpython, wrapper can written in c of package such swig, in cython, or in python of ctypes module. wrapper must translate python inputs c values, define c output varibles, call c function, check return code, , either translate c output python , return or translate c code python exception , raise it.

it appears using python's zlib, wraps c zlib. defines python exception class error.

>>> import zlib >>> zlib.error <class 'zlib.error'> >>> issubclass(zlib.error, exception) true

you catch other exception.

>>> try:     raise zlib.error('error 99: unknown') except zlib.error e:     print(e)  error 99: unknown

to consistent exception naming convention, have named itzliberror.


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