Other operations

All

We can get all values of items in Database without their keys.

>>> db.all()
[{'type': 'Yogurt'}, {'type': 'Apple'}, {'type': 'Banana'}]

Clear

The clear method removes all of the objects.

>>> db.clear()

Has

If we want to know whether Database has key, here is easy way to know. Please see the following examples.

>>> db.keys()
dict_keys(['AwMJDzrjkpWJCee5iSozXW', '5C8SJM54ogkCmsNJA2Cdja', '8LEJS5uGuopxcPQ3uKN8ty'])
>>> db.has('AwMJDzrjkpWJCee5iSozXW')
True
>>> db.has('NotExistsKeyString')
False

And it supports the parameter of list type as it will return list of each result as boolean.

>>> db.has(['AwMJDzrjkpWJCee5iSozXW', 'NotExistsKeyString'])
[True, False]

Count

>>> db.count()
3

>>> len(db)
3

Drop

This works as same as clear() method, but this returns the count of dropped items. As you know, the count of dropped one is exactly equal to the count using count() before dropping.

>>> db.all()
[{'type': 'Yogurt'}, {'type': 'Apple'}, {'type': 'Banana'}]
>>> db.drop()
3
>>> db.all()
[]
>>> db.drop()
0