kopia lustrzana https://github.com/micropython/micropython
70 wiersze
2.0 KiB
ReStructuredText
70 wiersze
2.0 KiB
ReStructuredText
The internal filesystem
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=======================
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If your devices has 1Mbyte or more of storage then it will be set up (upon first
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boot) to contain a filesystem. This filesystem uses the FAT format and is
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stored in the flash after the MicroPython firmware.
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Creating and reading files
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--------------------------
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MicroPython on the ESP8266 supports the standard way of accessing files in
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Python, using the built-in ``open()`` function.
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To create a file try::
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>>> f = open('data.txt', 'w')
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>>> f.write('some data')
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9
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>>> f.close()
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The "9" is the number of bytes that were written with the ``write()`` method.
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Then you can read back the contents of this new file using::
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>>> f = open('data.txt')
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>>> f.read()
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'some data'
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>>> f.close()
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Note that the default mode when opening a file is to open it in read-only mode,
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and as a text file. Specify ``'wb'`` as the second argument to ``open()`` to
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open for writing in binary mode, and ``'rb'`` to open for reading in binary
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mode.
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Listing file and more
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---------------------
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The os module can be used for further control over the filesystem. First
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import the module::
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>>> import os
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Then try listing the contents of the filesystem::
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>>> os.listdir()
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['boot.py', 'port_config.py', 'data.txt']
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You can make directories::
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>>> os.mkdir('dir')
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And remove entries::
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>>> os.remove('data.txt')
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Start up scripts
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----------------
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There are two files that are treated specially by the ESP8266 when it starts up:
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boot.py and main.py. The boot.py script is executed first (if it exists) and
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then once it completes the main.py script is executed. You can create these
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files yourself and populate them with the code that you want to run when the
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device starts up.
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Accessing the filesystem via WebREPL
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------------------------------------
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You can access the filesystem over WebREPL using the web client in a browser
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or via the command-line tool. Please refer to Quick Reference and Tutorial
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sections for more information about WebREPL.
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