my_item = next((item for item in my_list if item['id'] == my_unique_id), None)
This iterates through the list until it finds the first item matching my_unique_id
, then stops. It doesn’t store any intermediate lists in memory (by using a generator expression) or require an explicit loop. It sets my_item
to None
of no object is found. It’s approximately the same as
for item in my_list:
if item['id'] == my_unique_id:
my_item = item
break
else:
my_item = None
else
clauses on for
loops are used when the loop is not ended by a break
statement.