[AstroPy] how to detect emission lines in sloan spectrum?

[gonghang.naoc]

hi,

Is there any handy module to detect emission lines in a spectrum like one
we get from sdss?The spectra of sloan are fits files and the wavelength
calibration has been done.Suppose the redshift is smaller than 300km/s

Case A:
We have a spectral line list.We just want to know whether there are some
kinds of  emission lines in the fits files.

Case B:
We do not have a line list.We just want to detect emission lines.

Thank you.
hang
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