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125 lines
4.4 KiB
ReStructuredText
125 lines
4.4 KiB
ReStructuredText
.. _codesnippets:
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Advanced Instaloader Examples
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=============================
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.. currentmodule:: instaloader
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.. highlight:: python
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.. contents::
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:backlinks: none
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Here we present code examples that use the :ref:`python-module-instaloader` for
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more advanced Instagram downloading or metadata mining than what is possible
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with the Instaloader command line interface.
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The scripts presented here can be downloaded from our source tree:
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`instaloader/docs/codesnippets/ <https://github.com/instaloader/instaloader/tree/master/docs/codesnippets>`__
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.. For each code snippet:
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- title
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- brief description of what it does / motivation / how it works
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- code, or link to code
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- link to discussion issue
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- link used methods
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Download Posts in a Specific Period
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-----------------------------------
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To only download Instagram pictures (and metadata) that are within a specific
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period, you can simply use :func:`~itertools.dropwhile` and
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:func:`~itertools.takewhile` from :mod:`itertools` on a generator that returns
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Posts in **exact chronological order**, such as :meth:`Profile.get_posts`.
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.. literalinclude:: codesnippets/121_since_until.py
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See also :class:`Post`, :meth:`Instaloader.download_post`.
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Discussed in :issue:`121`.
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The code example with :func:`~itertools.dropwhile` and
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:func:`~itertools.takewhile` makes the assumption that the post iterator returns
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posts in exact chronological order. As discussed in :issue:`666`, the following
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approach fits for an **almost chronological order**, where up to *k* older posts
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are inserted into an otherwise chronological order, such as a Hashtag feed.
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.. literalinclude:: codesnippets/666_historical_hashtag_data.py
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Likes of a Profile / Ghost Followers
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------------------------------------
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To obtain a list of your inactive followers, i.e. followers that did not like
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any of your pictures, you can use this approach.
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.. literalinclude:: codesnippets/120_ghost_followers.py
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See also :meth:`Profile.get_posts`, :meth:`Post.get_likes`,
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:meth:`Profile.get_followers`, :meth:`Instaloader.load_session_from_file`,
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:meth:`Profile.from_username`.
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Discussed in :issue:`120`.
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Track Deleted Posts
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-------------------
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This script uses Instaloader to obtain a list of currently-online Instagram and
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compares it with the set of posts that you already have downloaded. It outputs
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a list of posts which are online but not offline (i.e. not yet downloaded) and a
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list of posts which are offline but not online (i.e. deleted in the profile).
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.. literalinclude:: codesnippets/56_track_deleted.py
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See also :func:`load_structure_from_file`, :meth:`Profile.from_username`,
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:meth:`Profile.get_posts`, :class:`Post`.
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Discussed in :issue:`56`.
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Only one Post per User
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----------------------
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To download only the single most recent post per user within a hashtag feed,
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this snippet uses a :class:`set` that contains the users of whom a post has
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already been downloaded. For each post, it checks whether the post's creator is
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already contained in that set. If not, the post is downloaded from Instagram and
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the user is added to that set.
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.. literalinclude:: codesnippets/113_only_one_per_user.py
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See also :class:`Post`, :meth:`Instaloader.download_post`,
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:attr:`Post.owner_profile`, :class:`Profile`.
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Discussed in :issue:`113`.
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Top X Posts of User
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-------------------
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With Instaloader, it is easy to download the few most-liked pictures of a user.
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.. literalinclude:: codesnippets/194_top_x_of_user.py
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Discussed in :issue:`194`.
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Metadata JSON Files
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-------------------
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The JSON files Instaloader saves along with each Post contain all the metadata
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that has been retrieved from Instagram while downloading the picture and
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associated required information.
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With `jq <https://stedolan.github.io/jq/>`__, a command-line JSON processor, the
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metadata can be easily post-processed. For example, Instaloader's JSON files can
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be pretty-formatted with:
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.. code-block:: none
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xzcat 2018-05-13_11-18-45_UTC.json.xz | jq .node
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However, Instaloader tries to do as few metadata requests as possible, so,
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depending on how Instaloader has been invoked, it may occur that these files do
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not contain the complete available metadata structure. Nevertheless, the file
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can be loaded into Instaloader with :func:`load_structure_from_file` and the
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required metadata then be accessed via the :class:`Post` or :class:`Profile`
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attributes, which trigger an Instagram request if that particular information is
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not present in the JSON file.
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