Django Middleware-like design pattern

PIPELINE = (
 'validation.contains_dot',
 'validation.contains_at',
 'mutators.lowercase_domain',
 'mutators.lowercase_name',
 'validation.does_not_bounce_back',
)


class EmailValidator(object):

 def __init__(self, email):

 self._pipelines = []
 self.load_pipelines()
 self.email = email

 for func in self._pipelines:
 res = func(self.email)
 if res:
 self.email = res

 def get_email(self):
 return self.email

 def load_pipelines(self):
 for line in PIPELINE:
 mod_name, func_name = line.split('.')
 mod = __import__(mod_name)
 func = getattr(mod, func_name)
 self._pipelines.append(func)


email = EmailValidator('Test@UPPER.COM').get_email()
print email

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