/usr/lib/python2.7/dist-packages/chaco/_isnan.h is in python-chaco 4.4.1-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #ifdef _WIN32
#include <float.h>
#define isnan _isnan
#else
#include <math.h>
#endif
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