How to get the list of error numbers (Errno) for an Exception type in python?

I fear those come straight from the standard C library, so you'll have to look it up in your system documentation. (GLibC, Microsoft, UNIX…)

look for errno.h on your system.

As others said, you should check <errno.h> of your system.

If you want to do it in python:

import errno
print errno.errorcode

output would be

{1: 'EPERM', 2: 'ENOENT', 3: 'ESRCH', 4: 'EINTR', 5: 'EIO', 6: 'ENXIO', 7: 'E2BIG', 8: 'ENOEXEC', 9: 'EBADF', 10: 'ECHILD', 11: 'EDEADLK', 12: 'ENOMEM', 13: 'EACCES', 14: 'EFAULT', 15: 'ENOTBLK', 16: 'EBUSY', 17: 'EEXIST', 18: 'EXDEV', 19: 'ENODEV', 20: 'ENOTDIR', 21: 'EISDIR', 22: 'EINVAL', 23: 'ENFILE', 24: 'EMFILE', 25: 'ENOTTY', 26: 'ETXTBSY', 27: 'EFBIG', 28: 'ENOSPC', 29: 'ESPIPE', 30: 'EROFS', 31: 'EMLINK', 32: 'EPIPE', 33: 'EDOM', 34: 'ERANGE', 35: 'EAGAIN', 36: 'EINPROGRESS', 37: 'EALREADY', 38: 'ENOTSOCK', 39: 'EDESTADDRREQ', 40: 'EMSGSIZE', 41: 'EPROTOTYPE', 42: 'ENOPROTOOPT', 43: 'EPROTONOSUPPORT', 44: 'ESOCKTNOSUPPORT', 46: 'EPFNOSUPPORT', 47: 'EAFNOSUPPORT', 48: 'EADDRINUSE', 49: 'EADDRNOTAVAIL', 50: 'ENETDOWN', 51: 'ENETUNREACH', 52: 'ENETRESET', 53: 'ECONNABORTED', 54: 'ECONNRESET', 55: 'ENOBUFS', 56: 'EISCONN', 57: 'ENOTCONN', 58: 'ESHUTDOWN', 59: 'ETOOMANYREFS', 60: 'ETIMEDOUT', 61: 'ECONNREFUSED', 62: 'ELOOP', 63: 'ENAMETOOLONG', 64: 'EHOSTDOWN', 65: 'EHOSTUNREACH', 66: 'ENOTEMPTY', 68: 'EUSERS', 69: 'EDQUOT', 70: 'ESTALE', 71: 'EREMOTE', 77: 'ENOLCK', 78: 'ENOSYS', 84: 'EOVERFLOW', 90: 'EIDRM', 91: 'ENOMSG', 92: 'EILSEQ', 94: 'EBADMSG', 95: 'EMULTIHOP', 96: 'ENODATA', 97: 'ENOLINK', 98: 'ENOSR', 99: 'ENOSTR', 100: 'EPROTO', 101: 'ETIME', 102: 'EOPNOTSUPP'}

Since the error codes are different by platform, and the language of the user may be different, it is usually best to print the exception in the normal fashion.

However, if you really want the list:

import os
import errno

print {i:os.strerror(i) for i in sorted(errno.errorcode)}
        

Prints (on OS X):

{1: 'Operation not permitted', 2: 'No such file or directory',
 3: 'No such process', 4: 'Interrupted system call',
 5: 'Input/output error', 6: 'Device not configured',
 7: 'Argument list too long', 8: 'Exec format error',
 9: 'Bad file descriptor', 10: 'No child processes',
 11: 'Resource deadlock avoided', 12: 'Cannot allocate memory',
 13: 'Permission denied', 14: 'Bad address', 15: 'Block device required',
 16: 'Resource busy', 17: 'File exists', 18: 'Cross-device link',
 19: 'Operation not supported by device', 20: 'Not a directory',
 21: 'Is a directory', 22: 'Invalid argument',
 23: 'Too many open files in system', 24: 'Too many open files',
 25: 'Inappropriate ioctl for device', 26: 'Text file busy',
 27: 'File too large', 28: 'No space left on device', 29: 'Illegal seek',
 30: 'Read-only file system', 31: 'Too many links', 32: 'Broken pipe',
 33: 'Numerical argument out of domain', 34: 'Result too large',
 35: 'Resource temporarily unavailable', 36: 'Operation now in progress',
 37: 'Operation already in progress', 38: 'Socket operation on non-socket',
 39: 'Destination address required', 40: 'Message too long',
 41: 'Protocol wrong type for socket', 42: 'Protocol not available',
 43: 'Protocol not supported', 44: 'Socket type not supported',
 46: 'Protocol family not supported',
 47: 'Address family not supported by protocol family',
 48: 'Address already in use', 49: "Can't assign requested address",
 50: 'Network is down', 51: 'Network is unreachable',
 52: 'Network dropped connection on reset',
 53: 'Software caused connection abort', 54: 'Connection reset by peer',
 55: 'No buffer space available', 56: 'Socket is already connected',
 57: 'Socket is not connected', 58: "Can't send after socket shutdown",
 59: "Too many references: can't splice", 60: 'Operation timed out',
 61: 'Connection refused', 62: 'Too many levels of symbolic links',
 63: 'File name too long', 64: 'Host is down', 65: 'No route to host',
 66: 'Directory not empty', 68: 'Too many users',
 69: 'Disc quota exceeded', 70: 'Stale NFS file handle',
 71: 'Too many levels of remote in path', 77: 'No locks available',
 78: 'Function not implemented',
 84: 'Value too large to be stored in data type', 90: 'Identifier removed',
 91: 'No message of desired type', 92: 'Illegal byte sequence',
 94: 'Bad message', 95: 'EMULTIHOP (Reserved)',
 96: 'No message available on STREAM', 97: 'ENOLINK (Reserved)',
 98: 'No STREAM resources', 99: 'Not a STREAM', 100: 'Protocol error',
 101: 'STREAM ioctl timeout', 102: 'Operation not supported on socket'}