Python Os Error
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a try statement with an except clause that mentions a particular class, that
Python Exception Message
clause also handles any exception classes derived from that class python custom exception (but not exception classes from which it is derived). Two exception classes that are not
Python Filenotfounderror
related via subclassing are never equivalent, even if they have the same name. The built-in exceptions listed below can be generated by the interpreter or built-in python valueerror example functions. Except where mentioned, they have an "associated value" indicating the detailed cause of the error. This may be a string or a tuple of several items of information (e.g., an error code and a string explaining the code). The associated value is usually passed as arguments to the exception class's constructor. python errno User code can raise built-in exceptions. This can be used to test an exception handler or to report an error condition "just like" the situation in which the interpreter raises the same exception; but beware that there is nothing to prevent user code from raising an inappropriate error. The built-in exception classes can be subclassed to define new exceptions; programmers are encouraged to derive new exceptions from the Exception class or one of its subclasses, and not from BaseException. More information on defining exceptions is available in the Python Tutorial under User-defined Exceptions. When raising (or re-raising) an exception in an except or finally clause __context__ is automatically set to the last exception caught; if the new exception is not handled the traceback that is eventually displayed will include the originating exception(s) and the final exception. When raising a new exception (rather than using a bare errno system symbols. The value of each symbol is
Python Exception Class Methods
the corresponding integer value. The names and descriptions are python attributeerror object has no attribute borrowed from linux/include/errno.h, which should be pretty all-inclusive. errno.errorcode¶ Dictionary providing a mapping
Python 3 Exceptions
from the errno value to the string name in the underlying system. For instance, errno.errorcode[errno.EPERM] maps to 'EPERM'. To translate a https://docs.python.org/3/library/exceptions.html numeric error code to an error message, use os.strerror(). Of the following list, symbols that are not used on the current platform are not defined by the module. The specific list of defined symbols is available as errno.errorcode.keys(). Symbols available can include: errno.EPERM¶ Operation https://docs.python.org/2/library/errno.html not permitted errno.ENOENT¶ No such file or directory errno.ESRCH¶ No such process errno.EINTR¶ Interrupted system call errno.EIO¶ I/O error errno.ENXIO¶ No such device or address errno.E2BIG¶ Arg list too long errno.ENOEXEC¶ Exec format error errno.EBADF¶ Bad file number errno.ECHILD¶ No child processes errno.EAGAIN¶ Try again errno.ENOMEM¶ Out of memory errno.EACCES¶ Permission denied errno.EFAULT¶ Bad address errno.ENOTBLK¶ Block device required errno.EBUSY¶ Device or resource busy errno.EEXIST¶ File exists errno.EXDEV¶ Cross-device link errno.ENODEV¶ No such device errno.ENOTDIR¶ Not a directory errno.EISDIR¶ Is a directory errno.EINVAL¶ Invalid argument errno.ENFILE¶ File table overflow errno.EMFILE¶ Too many open files errno.ENOTTY¶ Not a typewriter errno.ETXTBSY¶ Text file busy errno.EFBIG¶ File too large errno.ENOSPC¶ No space left on device errno.ESPIPE¶ Illegal seek errno.EROFS¶ Read-only file system errno.EMLINK¶ Too many links errno.EPIPE¶ Broken pipe errno.EDOM¶ Math argument out of domain of func errno.ERANGE¶ Math resu
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of http://stackoverflow.com/questions/20517785/python-except-oserror-e-no-longer-working-in-3-3-3 this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up python exception Python - except (OSError, e) - No longer working in 3.3.3? up vote 1 down vote favorite The following have worked throughout Python 3.X and is not broke in 3.3.3, can't find what's changed in the docs. import os def pid_alive(pid): pid = int(pid) if pid < 0: return False try: os.kill(pid, 0) except (OSError, e): return e.errno == errno.EPERM else: return True python os error Tried different variations of the except line, for instance except OSError as e: but then errno.EPERM breaks etc. Any quick pointers? python exception-handling python-3.3 share|improve this question edited Apr 14 '14 at 22:52 Martijn Pieters♦ 502k7513181473 asked Dec 11 '13 at 11:23 Torxed 9,46854169 add a comment| 1 Answer 1 active oldest votes up vote 12 down vote accepted The expression except (OSError, e) never worked in Python, not in the way you think it works. That expresion catches two types of exception; OSError or whatever the global e refers to. Your code breaks when there is no global name e. The correct expression for Python 3 and Python 2.6 and newer is: except OSError as e: Python 2 also supports the syntax: except OSError, e: without parenthesis, or: except (OSError, ValueError), e: to catch more than one type. The syntax was very confusing, as you yourself discovered here. The change was added in Python 2.6 and up, see PEP 3110 - Catching Exceptions in Python 3000 and the Exception-handling changes section of the 2.6 What's New document. As for an exception for errno.EPERM; you didn't