python - What happens if I put an entity to Google App Engine Datastore twice? -

suppose have create new entity follows:

item = item() item.property = property_value item_key1 = item.put() 

question 1: in same file after line, happens if following:

item_key2 = item.put() 

now, datastore have 1 entity - item, or datastore have 2 entities identified item_key1 , item_key2, respectively?

question 2: in same file after line (without code added in question 1), happens if following:

item.property = new_property_value item.put() 

does same entity in datastore updated, or datastore create new entity property equals new_property_value?

a follow question question 2: if datastore creates 2 entities in case, mean have following update entity, if entity created in same function?

item = item()  item.property = property_value # entity written datastore item_key = item.put()  # entity datastore make sure entity update item = item_key.get()  # update value item.property = new_property_value # put datastore item.put()  

this looks silly, , cost twice in datastore write.

thanks.

the answer both of questions have 1 entity.

when put entity datastore, overwrites existing entity same key. once call put(), item has unique key. every subsequent put() on same item overwrite existing entity in datastore.

you have 2 entities in following case:

item = item() item_key1 = item.put()  item = item() item_key2 = item.put()