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Number of current HDU in FITS file


N = getHDUnum(fptr)


N = getHDUnum(fptr) returns the number of the current HDU in the FITS file. The primary array has HDU number 1.

This function corresponds to the fits_get_hdu_num (ffghdn) function in the CFITSIO library C API.


fptr = fits.openFile('tst0012.fits');
n = fits.getHDUnum(fptr);