PythonExtra/docs/library/errno.rst

errno -- system error codes

errno

python:errno.

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

Constants

EEXIST, EAGAIN, etc.

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:

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

errorcode

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

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