serialize astropy.modeling instance to ASDF

modeling_to_asdf.py

>>> from astropy.modeling import models, fitting                                
>>> import asdf                                                                 
>>> import numpy as np                                                          
>>> x = np.random.random(100)                                                   
>>> y = np.random.random(100)                                                   
>>>                                                                             
>>> mymodel = models.Polynomial1D(degree=3) 
>>> fitter = fitting.LevMarLSQFitter() 
>>> myfit = fitter(mymodel,x,y)                                                   
WARNING: Model is linear in parameters; consider using linear fitting methods. [astropy.modeling.fitting]
>>>
>>> myfit                                                                       
<Polynomial1D(3, c0=0.55412012, c1=-1.00790666, c2=1.53229478, c3=-0.54992893)>
>>> tree = dict(model=myfit)                                                    
>>> af = asdf.AsdfFile(tree=tree)                                               
>>> af.tree['model']                                                            
<Polynomial1D(3, c0=0.55412012, c1=-1.00790666, c2=1.53229478, c3=-0.54992893)>
>>> af.write_to('mymodel.asdf')                                                 
>>> new = asdf.open('mymodel.asdf').tree['model']                               
>>> new                                                                         
<Polynomial1D(3, c0=0.55412012, c1=-1.00790666, c2=1.53229478, c3=-0.54992893)>
>>>