Python Raise Connection Error
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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 "