This is the documentation for the latest development branch of MicroPython and may refer to features that are not available in released versions.

If you are looking for the documentation for a specific release, use the drop-down menu on the left and select the desired version.

errno – system error codes

This module implements a subset of the corresponding CPython module, as described below. For more information, refer to the original CPython documentation: errno.

This module provides access to symbolic error codes for OSError exception. A particular inventory of codes depends on MicroPython port.



Error codes, based on ANSI C/POSIX standard. All error codes start with “E”. As mentioned above, inventory of the codes depends on MicroPython port. Errors are usually accessible as exc.errno where exc is an instance of OSError. Usage example:

except OSError as exc:
    if exc.errno == errno.EEXIST:
        print("Directory already exists")

Dictionary mapping numeric error codes to strings with symbolic error code (see above):

>>> print(errno.errorcode[errno.EEXIST])