Python - Unusual IndentationError involving a class : When trying to develop a class, I get this error.

    from __future__ import division
    import numpy as np
    import scipy as sp
    import itertools as it
    from scipy.integrate import quad
    import astropy.cosmology
    from astropy import units as u

    class NFW:	

    File "/Users/alexandres/Illustris/Scripts/NFWprofile2.py", line 10
    
                   ^
    IndentationError: expected an indented block
    [Finished in 0.1s with exit code 1]
    [shell_cmd: python -u "/Users/alexandres/Illustris/Scripts/NFWprofile2.py"]
    [dir: /Users/alexandres/Illustris/Scripts]
    [path: /usr/bin:/bin:/usr/sbin:/sbin]

How on earth is this an indentation error?

regardless if i define the class as `NFW()` or `NFW(object)`, this is occurring.

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