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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 this site About Us Learn more about Stack Overflow the company exception occurred type error object doesn't support this property or method Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs python exception class Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, python exception message just like you, helping each other. Join them; it only takes a minute: Sign up python: How do I know what type of exception occured? up vote 64 down vote favorite 23 I have a function called python custom exception by the main program: try: someFunction() except: print "exception happened!" but in the middle of the execution of the function it raises exception, so it jumps to the except part. How can I see exactly what happened in the someFunction() that caused the exception to happen? python exception share|improve this question edited Apr 30 '12 at 13:41 asked Mar 22 '12 at 14:08 Shang Wang 11.6k53163 3 Never ever ever use bare except: (without

Exception Occurred Object Error

a bare raise), except maybe once per program, and preferably not then. –Mike Graham Mar 22 '12 at 14:18 If you use multiple except clauses you wont need to check the exception type, that is what is usually done to act accordingly to a specific exception type. –Rik Poggi Mar 22 '12 at 14:29 1 If you care about the type of exception, it's because you've already considered what types of exception might logically occur. –Karl Knechtel Mar 22 '12 at 14:48 add a comment| 10 Answers 10 active oldest votes up vote 122 down vote accepted The other answers all point out that you should not catch generic exceptions, but no one seems to want to tell you why, which is essential to understanding when you can break the "rule". Here is an explanation. Basically, it's so that you don't hide the fact that an error occured the specifics of the error that occured (error hiding antipattern) So as long as you take care to do none of those things, it's OK to catch the generic exception. For instance, you could provide information about the exception to the user another way, like: Present exceptions as dialogs in a GUI Transfer exceptions from a worker thread or process to the controlling thread or process in a multithreading

This module never needs to be imported explicitly: the exceptions are provided in the built-in namespace as well as the exceptions module. For class

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exceptions, in a try statement with an except clause python exception stack trace that mentions a particular class, that clause also handles any exception classes derived from that class (but not python catch all exceptions exception classes from which it is derived). Two exception classes that are not related via subclassing are never equivalent, even if they have the same name. The built-in exceptions http://stackoverflow.com/questions/9823936/python-how-do-i-know-what-type-of-exception-occured listed below can be generated by the interpreter or built-in functions. Except where mentioned, they have an "associated value" indicating the detailed cause of the error. This may be a string or a tuple containing several items of information (e.g., an error code and a string explaining the code). The associated value is the second argument to the https://docs.python.org/2/library/exceptions.html class="pre">raise statement. If the exception class is derived from the standard root class BaseException, the associated value is present as the exception instance's args attribute. 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. The following exceptions are only used as base classes for other exceptions. exception BaseException¶ The base class for all built-in exceptions. It is not meant to be directly inherited by user-defined classes (for that, use Exception). If str() or unicode() is called on an instance of this class,

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 of complaint you get while you are https://docs.python.org/3.3/tutorial/errors.html still learning Python: >>> while True print('Hello world') File "", line 1, in ? while True print('Hello world') ^ SyntaxError: invalid syntax The parser repeats the offending line and displays a little ‘arrow' pointing at the earliest point in https://www.tutorialspoint.com/javascript/javascript_error_handling.htm the line where the error was detected. The error is caused by (or at least detected at) the token preceding the arrow: in the example, the error is detected at the function print(), since a colon (':') is python exception 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 are not unconditionally fatal: you will soon learn how to handle them in Python programs. Most exceptions are not handled by programs, error type exception however, and result in error messages as shown here: >>> 10 * (1/0) Traceback (most recent call last): File "", line 1, in ? ZeroDivisionError: division by zero >>> 4 + spam*3 Traceback (most recent call last): File "", line 1, in ? NameError: name 'spam' is not defined >>> '2' + 2 Traceback (most recent call last): File "", line 1, in ? TypeError: Can't convert 'int' object to str implicitly The last line of the error message indicates what happened. Exceptions come in different types, and the type is printed as part of the message: the types in the example are ZeroDivisionError, NameError and TypeError. The string printed as the exception type is the name of the built-in exception that occurred. This is true for all built-in exceptions, but need not be true for user-defined exceptions (although it is a useful convention). Standard exception names are built-in identifiers (not reserved keywords). The rest of the line provides detail based on the type of exception and what caused it. The preceding part of the error message shows the context where the exception happened, in the form of a stack traceback. In general it contains a stack traceback listing source lines; however, it will not display lines read from standard input. Built-in Exceptions lists the built-in exceptions and their meanings. 8.3. Handling Exceptions¶ It is possible to write programs that handle selecte

Syntax Javascript - Enabling Javascript - Placement Javascript - Variables Javascript - Operators Javascript - If...Else Javascript - Switch Case Javascript - While Loop Javascript - For Loop Javascript - For...in Javascript - Loop Control Javascript - Functions Javascript - Events Javascript - Cookies Javascript - Page Redirect Javascript - Dialog Boxes Javascript - Void Keyword Javascript - Page Printing JavaScript Objects Javascript - Objects Javascript - Number Javascript - Boolean Javascript - Strings Javascript - Arrays Javascript - Date Javascript - Math Javascript - RegExp Javascript - HTML DOM JavaScript Advanced Javascript - Error Handling Javascript - Validations Javascript - Animation Javascript - Multimedia Javascript - Debugging Javascript - Image Map Javascript - Browsers IMS DB Resources Javascript - Questions And Answers Javascript - Quick Guide Javascript - Functions Javascript - Resources Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who JavaScript - Errors & Exceptions Handling Advertisements Previous Page Next Page There are three types of errors in programming: (a) Syntax Errors, (b) Runtime Errors, and (c) Logical Errors. Syntax Errors Syntax errors, also called parsing errors, occur at compile time in traditional programming languages and at interpret time in JavaScript. For example, the following line causes a syntax error because it is missing a closing parenthesis. When a syntax error occurs in JavaScript, only the code contained within the same thread as the syntax error is affected and the rest of the code in other threads gets executed assuming nothing in them depends on the code containing the e

 

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