Vous êtes un professionnel et vous avez besoin d'une formation ? Sensibilisation à
l'Intelligence Artificielle Voir le programme détaillé

Classe « Cursor »

Opérateur pymongo.cursor.Cursor.__getitem__

Signature de la opérateur __getitem__

def __getitem__(self, index: 'Union[int, slice]') -> 'Union[_DocumentType, Cursor[_DocumentType]]' 

Description

help(Cursor.__getitem__)

Get a single document or a slice of documents from this cursor.

.. warning:: A :class:`~Cursor` is not a Python :class:`list`. Each
  index access or slice requires that a new query be run using skip
  and limit. Do not iterate the cursor using index accesses.
  The following example is **extremely inefficient** and may return
  surprising results::

    cursor = db.collection.find()
    # Warning: This runs a new query for each document.
    # Don't do this!
    for idx in range(10):
        print(cursor[idx])

Raises :class:`~pymongo.errors.InvalidOperation` if this
cursor has already been used.

To get a single document use an integral index, e.g.::

  >>> db.test.find()[50]

An :class:`IndexError` will be raised if the index is negative
or greater than the amount of documents in this cursor. Any
limit previously applied to this cursor will be ignored.

To get a slice of documents use a slice index, e.g.::

  >>> db.test.find()[20:25]

This will return this cursor with a limit of ``5`` and skip of
``20`` applied.  Using a slice index will override any prior
limits or skips applied to this cursor (including those
applied through previous calls to this method). Raises
:class:`IndexError` when the slice has a step, a negative
start value, or a stop value less than or equal to the start
value.

:param index: An integer or slice index to be applied to this cursor

Vous êtes un professionnel et vous avez besoin d'une formation ? Coder avec une
Intelligence Artificielle Voir le programme détaillé