> Can someone explain this construct to me?
You'd want to look for "list comprehension" documentation in Python
The code snipped can be rewritten as:
errors = []
for field_name in required_fields:
if self._is_empty(ticket[field_name]):
errors.append((field_name, '%s is required' % field_name))
> errors = [(field_name, '%s is required' % field_name)
> for field_name in required_fields
> if self._is_empty(ticket[field_name])]
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