:mod:`imghdr` --- Determine the type of an image

.. module:: imghdr
 :synopsis: Determine the type of image contained in a file or byte stream.

Source code: :source:`Lib/imghdr.py`

The :mod:`imghdr` module determines the type of image contained in a file or byte stream.

The :mod:`imghdr` module defines the following function:

.. function:: what(filename, h=None)

 Tests the image data contained in the file named by *filename*, and returns a
 string describing the image type. If optional *h* is provided, the *filename*
 is ignored and *h* is assumed to contain the byte stream to test.

 .. versionchanged:: 3.6
 Accepts a :term:`path-like object`.

The following image types are recognized, as listed below with the return value from :func:`what`:

.. versionadded:: 3.5
 The *exr* and *webp* formats were added.

You can extend the list of file types :mod:`imghdr` can recognize by appending to this variable:

.. data:: tests

 A list of functions performing the individual tests. Each function takes two
 arguments: the byte-stream and an open file-like object. When :func:`what` is
 called with a byte-stream, the file-like object will be ``None``.

 The test function should return a string describing the image type if the test
 succeeded, or ``None`` if it failed.

Example:

>>> import imghdr
>>> imghdr.what('bass.gif')
'gif'

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