Python Error Message Class
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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, python exception class are perhaps the most common kind of complaint you get while you are
Python Exception Message
still learning Python: >>> while True print 'Hello world' File "
Python Exception Stack Trace
(or at least detected at) the token preceding the arrow: in the example, 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 syntax for generic except clause in python 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, 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
with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack is nested try block possible in python Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up python exception message capturing up vote 75 down vote favorite 7 import https://docs.python.org/2.7/tutorial/errors.html ftplib import urllib2 import os import logging logger = logging.getLogger('ftpuploader') hdlr = logging.FileHandler('ftplog.log') formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s') hdlr.setFormatter(formatter) logger.addHandler(hdlr) logger.setLevel(logging.INFO) FTPADDR = "some ftp address" def upload_to_ftp(con, filepath): try: f = open(filepath,'rb') # file to send con.storbinary('STOR '+ filepath, f) # Send the file f.close() # Close file and FTP logger.info('File successfully uploaded to '+ FTPADDR) except, e: logger.error('Failed to upload to ftp: '+ str(e)) This doesn't seem http://stackoverflow.com/questions/4690600/python-exception-message-capturing to work, I get syntax error, what is the proper way of doing this for logging all kind of exceptions to a file python exception logging except share|improve this question asked Jan 14 '11 at 11:33 Hellnar 11.5k46144233 2 Your indentation is broken. And omit the , after except. –Sven Marnach Jan 14 '11 at 11:35 2 @SvenMarnach, if you omit the , after except, you'll get global name 'e' is not defined, which is not much better than wrong syntax. –Val Nov 18 '13 at 11:11 4 @Val: Should be except Exception as e or except Exception, e, depending on Python version. –Sven Marnach Nov 19 '13 at 13:03 add a comment| 5 Answers 5 active oldest votes up vote 110 down vote accepted You have to define which type of exception you want to catch. So write except Exception, e: instead of except, e: for a general exception (that will be logged anyway). Other possibility is to write your whole try/except code this way: try: with open(filepath,'rb') as f: con.storbinary('STOR '+ filepath, f) logger.info('File successfully uploaded to '+ FTPADDR) except Exception, e: logger.error('Failed to upload to ftp: '+ str(e)) share|improve this answer answered Jan 14 '11 at 11:40 eumiro 84
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 http://stackoverflow.com/questions/6180185/custom-python-exceptions-with-error-codes-and-error-messages the company Business Learn more about hiring developers or posting ads with us Stack https://www.codementor.io/python/tutorial/how-to-write-python-custom-exceptions Overflow Questions Jobs 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; it only takes a minute: Sign up Custom Python Exceptions with Error Codes and Error Messages up vote 22 down vote favorite 11 class python exception AppError(Exception): pass class MissingInputError(AppError): pass class ValidationError(AppError): pass ... def validate(self): """ Validate Input and save it """ params = self.__params if 'key' in params: self.__validateKey(escape(params['key'][0])) else: raise MissingInputError if 'svc' in params: self.__validateService(escape(params['svc'][0])) else: raise MissingInputError if 'dt' in params: self.__validateDate(escape(params['dt'][0])) else: raise MissingInputError def __validateMulti(self, m): """ Validate Multiple Days Request""" if m not in Input.__validDays: raise ValidationError self.__dCast = int(m) validate() and __validateMulti() are methods of a class that python error message validates and store the passed input parameters. As is evident in the code, I raise some custom exceptions when some input parameter is missing or some validation fails. I'd like to define some custom error codes and error messages specific to my app like, Error 1100: "Key parameter not found. Please verify your input." Error 1101: "Date parameter not found. Please verify your input" ... Error 2100: "Multiple Day parameter is not valid. Accepted values are 2, 5 and 7." and report the same to the user. How do I define these error codes and error messages in the custom exceptions? How do I raise / trap exception in a way that I know what error code / message to display? (P.S: This is for Python 2.4.3). Bastien Léonard mentions in this SO comment that you don't need to always define a new __init__ or __str__; by default, arguments will be placed in self.args and they will be printed by __str__. Thus, the solution I prefer: class AppError(Exception): pass class MissingInputError(AppError): # define the error codes & messages here em = {1101: "Some error here. Please verify.", \ 1102: "Another here. Please verify.", \ 1103: "One more here. Please verify.", \ 1104: "That was idiotic. Please verify."} Usage: try: # do something h
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