You can reroll your original example like this:
def __str__(self):
pk = self.pk
customer_name = None
customer_phone = None
try:
customer_name = self.lead.customer_name
customer_phone = self.lead.customer_phone
except AttributeError:
pass
return _(u'#{0}, {1}, {2}').format(
pk,
customer_name,
customer_phone,
)
Much more pythonic, IMO.
-James
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