micropython/docs/library/_io.rst

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:mod:`_io` -- input/output streams
==================================
.. module:: _io
:synopsis: input/output streams
This module contains additional types of stream (file-like) objects
and helper functions.
Functions
---------
.. function:: open(name, mode='r', **kwargs)
Open a file. Builtin ``open()`` function is alised to this function.
All ports (which provide access to file system) are required to support
`mode` parameter, but support for other arguments vary by port.
Classes
-------
.. class:: FileIO(...)
This is type of a file open in binary mode, e.g. using ``open(name, "rb")``.
You should not instantiate this class directly.
.. class:: TextIOWrapper(...)
This is type of a file open in text mode, e.g. using ``open(name, "rt")``.
You should not instantiate this class directly.
.. class:: StringIO([string])
.. class:: BytesIO([string])
In-memory file-like objects for input/output. `StringIO` is used for
text-mode I/O (similar to a normal file opened with "t" modifier).
`BytesIO` is used for binary-mode I/O (similar to a normal file
opened with "b" modifier). Initial contents of file-like objects
can be specified with `string` parameter (should be normal string
for `StringIO` or bytes object for `BytesIO`). All the usual file
methods like ``read()``, ``write()``, ``close()`` are available on
these objects, and additionally, following method:
.. method:: getvalue()
Get the current contents of the underlying buffer which holds data.