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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 valueerror python policies of this site About Us Learn more about Stack Overflow the

Python Custom Exception

company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users python exception message 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 python raise valueerror a minute: Sign up Correct way to try/except using Python requests module? up vote 79 down vote favorite 32 try: r = requests.get(url, params={'s': thing}) except requests.ConnectionError, e: print e #should I also sys.exit(1) after this? Is this correct? Is there a better way to structure this? Will this cover all my bases? python request python-requests share|improve this question edited Aug

Python Programming Can Handle Every Error Implicitly A) True B) False

27 '13 at 14:35 sorin 48.4k73247405 asked May 12 '13 at 19:44 John Smith 1,92872542 1 @JonathonReinhart Done. Thanks –John Smith Oct 31 '14 at 3:18 2 raw.githubusercontent.com/kennethreitz/requests/master/reque‌sts/… –Christophe Roussy Jun 27 at 8:41 add a comment| 1 Answer 1 active oldest votes up vote 165 down vote accepted Have a look at the Requests exception docs. In short: In the event of a network problem (e.g. DNS failure, refused connection, etc), Requests will raise a ConnectionError exception. In the event of the rare invalid HTTP response, Requests will raise an HTTPError exception. If a request times out, a Timeout exception is raised. If a request exceeds the configured number of maximum redirections, a TooManyRedirects exception is raised. All exceptions that Requests explicitly raises inherit from requests.exceptions.RequestException. To answer your question, what you show will not cover all of your bases. You'll only catch connection-related errors, not ones that time out. What to do when you catch the exception is really up to the design of your script/program. Is it acceptable to exit? Can you go on and try aga

a try statement with an except clause that mentions a particular class, that python requests connectionerror clause also handles any exception classes derived from that class (but python requests exception handling example not exception classes from which it is derived). Two exception classes that are not related

Python Connectionerror

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 functions. http://stackoverflow.com/questions/16511337/correct-way-to-try-except-using-python-requests-module 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. User code https://docs.python.org/3/library/exceptions.html 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 raise to re-raise the exceptio

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 https://docs.python.org/3/tutorial/errors.html get while you are still learning Python: >>> while True print('Hello world') File "", line 1 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 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(), python raise 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 are not unconditionally fatal: you will soon learn how to handle them in python raise connection 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 "", 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. Bu

 

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