errno — system error codes

This module provides access to symbolic error codes for the OSError exception, along with the errorcode dictionary mapping numeric codes back to their symbolic names.

Constants

The error codes below are based on the ANSI C / POSIX standard; each is an integer whose symbolic name starts with E. These are the codes provided on the OpenMV Cam. An error code is usually accessed 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")

errno.EPERM: int

Operation not permitted.

errno.ENOENT: int

No such file or directory.

errno.EIO: int

I/O error.

errno.EBADF: int

Bad file descriptor.

errno.EAGAIN: int

Resource temporarily unavailable. Returned by a non-blocking operation (e.g. a socket read/write) that would otherwise block.

errno.ENOMEM: int

Out of memory.

errno.EACCES: int

Permission denied.

errno.EEXIST: int

File or directory already exists.

errno.ENODEV: int

No such device.

errno.EISDIR: int

Is a directory (an operation that requires a file was applied to a directory).

errno.EINVAL: int

Invalid argument.

errno.EOPNOTSUPP: int

Operation not supported on the socket or device.

errno.EADDRINUSE: int

Address already in use.

errno.ECONNABORTED: int

Connection aborted.

errno.ECONNRESET: int

Connection reset by peer.

errno.ENOBUFS: int

No buffer space available.

errno.ENOTCONN: int

Socket is not connected.

errno.ETIMEDOUT: int

Connection or operation timed out.

errno.ECONNREFUSED: int

Connection refused.

errno.EHOSTUNREACH: int

Host is unreachable (no route to host).

errno.EALREADY: int

Operation already in progress.

errno.EINPROGRESS: int

Operation now in progress (e.g. a non-blocking connect()).

errno.errorcode: dict[int, str]

Dictionary mapping each numeric error code to a string with its symbolic name:

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