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Python Exception Error List


exception WindowsError¶ Raised when a Windows-specific error occurs or when the error number does not correspond to an errno value. print(inst.args) # arguments stored in .args ... Please verify your input." Error 1101: "Date parameter not found. You can do something like: 1 try: 2 a, b, c = d 3 except Exception as e: 4 e.args += (d,) 5 raise The .args attribute of exceptions is a http://vealcine.com/python-exception/python-modules-list-error.php

Navigation index modules | next | previous | Python » 2.7.12 Documentation » The Python Standard Library » 6. class BaseClass(object): """Defines the interface""" def __init__(self): super(BaseClass, self).__init__() def do_something(self): """The interface, not implemented""" raise NotImplementedError(self.__class__.__name__ + '.do_something') class SubClass(BaseClass): """Implementes the interface""" def do_something(self): """really does something""" print self.__class__.__name__ If it's a matter of cleanup that should be run regardless of success or failure, then you would do: 1 try: 2 do_some_stuff() 3 finally: 4 cleanup_stuff() Finding Specific Exception Names Input and Output Next topic 9. https://pymotw.com/2/exceptions/

Python Exception Message

print 'y =', y ... 'exceptions.Exception'> ('spam', 'eggs') ('spam', 'eggs') x = spam y = eggs If an exception has an argument, it is printed as the last part (‘detail') exception ValueError¶ Raised when a built-in operation or function receives an argument that has the right type but an inappropriate value, and the situation is not described by a more precise Handling an exception If you have some suspicious code that may raise an exception, you can defend your program by placing the suspicious code in a try: block.

AssertionError exceptions can be caught and handled like any other exception using the try-except statement, but if not handled, they will terminate the program and produce a traceback. Two exception classes that are not related via subclassing are never equivalent, even if they have the same name. strerror¶ The corresponding error message, as provided by the operating system. Python Catch Multiple Exceptions If you really want an AssertionError in this case, write assert distance > 0, 'Distance must be positive'.

import gc import weakref class ExpensiveObject(object): def __init__(self, name): self.name = name def __del__(self): print '(Deleting %s)' % self obj = ExpensiveObject('obj') p = weakref.proxy(obj) print 'BEFORE:', p.name obj = None Python Custom Exception Use this with extreme caution, since it is easy to mask a real programming error in this way! print("division by zero!") ... https://docs.python.org/2/library/exceptions.html code¶ The exit status or error message that is passed to the constructor. (Defaults to None.) exception TypeError¶ Raised when an operation or function is applied to an object

During execution, a check for interrupts is made regularly. Python Print Exception But you shouldn't error check that way because assertions can be turned off (python -O). –Two-Bit Alchemist Sep 16 '15 at 21:33 @Two-BitAlchemist Good point. Not the answer you're looking for? In addition to those of OSError, BlockingIOError can have one more attribute: characters_written¶ An integer containing the number of characters written to the stream before it blocked.

Python Custom Exception

This must be either an exception instance or an exception class (a class that derives from Exception). https://docs.python.org/3/library/exceptions.html Exception classes can be defined which do anything any other class can do, but are usually kept simple, often only offering a number of attributes that allow information about the error Python Exception Message Be sure to report the version of the Python interpreter (sys.version; it is also printed at the start of an interactive Python session), the exact error message (the exception's associated Python Exception Stack Trace Corresponds to errno EISDIR.

You *can* do it, say, with recursive generators, but it is difficult.) Joel's concern about multiple exit points is good advice, but it can be taken too far. weblink exception SystemError¶ Raised when the interpreter finds an internal error, but the situation does not look so serious to cause it to abandon all hope. HandlingExceptions (last edited 2015-11-06 01:04:13 by ElephantJim) MoinMoin PoweredPython PoweredGPL licensedValid HTML 4.01 Unable to edit the page? Exception hierarchy¶ The class hierarchy for built-in exceptions is: BaseException +-- SystemExit +-- KeyboardInterrupt +-- GeneratorExit +-- Exception +-- StopIteration +-- StandardError | +-- BufferError | +-- ArithmeticError | | +-- Python Raise Valueerror

  1. Errors and Exceptions¶ Until now error messages haven't been more than mentioned, but if you have tried out the examples you have probably seen some.
  2. C doesn't have a good way to do it at all, because the error returns are still in-band for regular returns.
  3. Changed in version 3.3: Added value attribute and the ability for generator functions to use it to return a value.
  4. exception TypeError¶ Raised when an operation or function is applied to an object of inappropriate type.

The TypeError raised by dividing two strings is not handled by the except clause and therefore re-raised after the finally clause has been executed. print(type(inst)) # the exception instance ... Implements logic for creating a string representation of the exception using str() from the arguments passed to the constructor. http://vealcine.com/python-exception/python-error-vs-exception.php Please donate.

The associated value is an error message that includes the name that could not be found. Python Filenotfounderror Instances of this class have attributes filename, lineno, offset and text for easier access to the details. str() of the exception instance returns only the message. exception AssertionError¶ Raised when an assert statement fails.

Base classes 5.2.

Example #!/usr/bin/python try: fh = open("testfile", "w") fh.write("This is my test file for exception handling!!") finally: print "Error: can\'t find file or read data" If you do not have permission to exception MemoryError¶ Raised when an operation runs out of memory but the situation may still be rescued (by deleting some objects). You want to raise an exception/error, and doing them will raise an error, but not the one intended! Python Exception Class Methods BaseException¶ Base class for all exceptions.


PyMOTW Home Blog The Book About Site Index If you find this information useful, consider picking up a copy of my book, The Python Standard Library By Example. Using fpectl is discouraged in the stdlib docs. This can be raised directly by codecs.lookup(). 5.2. http://vealcine.com/python-exception/python-3-io-error-exception.php Long integers allocate more space as values grow, so they end up raising MemoryError.

New in version 1.5.2. print('Goodbye, world!') ... FutureWarning Warning about changes to the language or library that are coming at a later time.