popping from dirty() wont change anything since its a set thats
generated each time it's called.
this is from the doc for dirty():
Note that this 'dirty' calculation is 'optimistic'; most
attribute-setting or collection modification operations will
mark an
instance as 'dirty' and place it in this set, even if there
is no net
change to the attribute's value. At flush time, the value of
each
attribute is compared to its previously saved value, and if
there's no
net change, no SQL operation will occur (this is a more
expensive
operation so it's only done at flush time).
To check if an instance has actionable net changes to its
attributes,
use the is_modified() method.
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