Now we use advanced import methods

Check out the contents of /option_models/init.py

from . import bsm
from . import normal
from . import sabr



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# when directory is imported, __init__.py is executed
# from __init__.py all sub modules are imported as well

import option_models as opt



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# you may call
opt.bsm.price, opt.bsm.Model









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(<function option_models.bsm.price>, option_models.bsm.Model)



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from option_models import bsm
# You can even do
#from option_models import bsm as bs



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bsm.price, bsm.Model









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(<function option_models.bsm.price>, option_models.bsm.Model)



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# The objects imported different ways are all same (as class type)
bsm.Model == opt.bsm.Model









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True



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# you can create instances 
bsm_model1 = bsm.Model(vol=0.2, texp=1)
bsm_model2 = opt.bsm.Model(vol=0.2, texp=1)



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# But class instances are diffferent !!
bsm_model1 == bsm_model2









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False

You cal also import a particular class or functions



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from option_models.bsm import Model
Model == bsm.Model
# However this is confusing. which Model?









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True



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# Always better to be explicit
from option_models.bsm import Model as BsmModel
from option_models.normal import Model as NormalModel

BsmModel == bsm.Model, NormalModel == opt.normal.Model









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(True, True)



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