Raise Python Error
you have probably seen some. There are (at least) two distinguishable kinds of errors: syntax errors and exceptions. 8.1. Syntax Errors¶ Syntax errors, also known as parsing errors, are perhaps the most common kind python raise custom exception of complaint you get while you are still learning Python: >>> while True print python raise valueerror 'Hello world' File "
Syntax For Raise Clause In Python
the error is detected at the keyword print, since a colon (':') is missing before it. File name and line number are printed so you know where to look in case the input came from a script. 8.2. Exceptions¶ Even if a statement or expression is syntactically correct, it may cause an error when an attempt is made to execute it. Errors detected during execution are called exceptions and python exception message are not unconditionally fatal: you will soon learn how to handle them in Python programs. Most exceptions are not handled by programs, however, and result in error messages as shown here: >>> 10 * (1/0) Traceback (most recent call last): File "
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Python Print Exception
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Python Try Except Else
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; https://docs.python.org/2.7/tutorial/errors.html it only takes a minute: Sign up Which exception should I raise on bad/illegal argument combinations in Python? up vote 237 down vote favorite 26 I was wondering about the best practices for indicating invalid argument combinations in Python. I've come across a few situations where you have a function like so: def import_to_orm(name, save=False, recurse=False): """ :param name: Name http://stackoverflow.com/questions/256222/which-exception-should-i-raise-on-bad-illegal-argument-combinations-in-python of some external entity to import. :param save: Save the ORM object before returning. :param recurse: Attempt to import associated objects as well. Because you need the original object to have a key to relate to, save must be `True` for recurse to be `True`. :raise BadValueError: If `recurse and not save`. :return: The ORM object. """ pass The only annoyance with this is that every package has its own, usually slightly differing BadValueError. I know that in Java there exists java.lang.IllegalArgumentException -- is it well understood that everybody will be creating their own BadValueErrors in Python or is there another, preferred method? python exception arguments share|improve this question edited Nov 2 '11 at 19:26 sth 128k33204309 asked Nov 1 '08 at 23:02 cdleary 27.4k40130178 add a comment| 4 Answers 4 active oldest votes up vote 246 down vote accepted I would just raise ValueError, unless you need a more specific exception.. def import_to_orm(name, save=False, recurse=False): if recurse and not save: raise ValueError("save must be True if recurse is True") There's really no point in doing c
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