The ``os``  Module
******************

.. py:module:: os

MicroPython contains an ``os`` module based upon the ``os`` module in the
Python standard library. It's used for accessing what would traditionally be
termed as operating system dependent functionality. Since there is no operating
system in MicroPython the module provides functions relating to the management
of the simple on-device persistent file system and information about the
current system.

To access this module you need to::

    import os

We assume you have done this for the examples below.

Functions
=========

.. py:function:: listdir()

    Returns a list of the names of all the files contained within the local
    persistent on-device file system.

.. py:function:: remove(filename)

    Removes (deletes) the file named in the argument ``filename``. If the file
    does not exist an ``OSError`` exception will occur.

.. py:function:: size(filename)

    Returns the size, in bytes, of the file named in the argument ``filename``.
    If the file does not exist an ``OSError`` exception will occur.

.. py:function:: uname()

    Returns information identifying the current operating system. The return
    value is an object with five attributes:

    * ``sysname`` - operating system name
    * ``nodename`` - name of machine on network (implementation-defined)
    * ``release`` - operating system release
    * ``version`` - operating system version
    * ``machine`` - hardware identifier


.. note::

    There is no underlying operating system in MicroPython. As a result the
    information returned by the ``uname`` function is mostly useful for
    versioning details.