Python Error Object Line Number
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Python Exception Class
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Python Exception Stack Trace
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Python Exception Message
helping each other. Join them; it only takes a minute: Sign up Python When I catch an exception, how do I get the type, file, and line number? up vote 115 down vote favorite 40 Catching an exception that would print like this: Traceback (most recent call last): File "c:/tmp.py", line 1, in 4 / 0 python custom exception ZeroDivisionError: integer division or modulo by zero I want to format it into: ZeroDivisonError, tmp.py, 1 python exception exception-handling stack-trace share|improve this question asked Aug 14 '09 at 16:02 Claudiu 94.7k92307493 1 Use the built-in traceback module. –Ned Deily Aug 14 '09 at 16:10 It may also be helpful to print line of code, where exception happened: see stackoverflow.com/questions/14519177/… –Apogentus Nov 28 '13 at 10:52 add a comment| 2 Answers 2 active oldest votes up vote 161 down vote accepted import sys, os try: raise NotImplementedError("No error") except Exception as e: exc_type, exc_obj, exc_tb = sys.exc_info() fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1] print(exc_type, fname, exc_tb.tb_lineno) share|improve this answer edited Feb 20 '13 at 18:51 David Cain 8,042104055 answered Aug 14 '09 at 16:09 Ants Aasma 30.8k46281 24 You should be careful about unpacking sys.exc_info() into local variables, since if you get an exception in the except handler, the local vars could get kept in a circular reference and not GC'd. Best practice is to always just use slices off
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 python print exception known as parsing errors, are perhaps the most common kind of complaint python catch multiple exceptions you get while you are still learning Python: >>> while True print 'Hello world' File "", line 1 python get exception type 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 http://stackoverflow.com/questions/1278705/python-when-i-catch-an-exception-how-do-i-get-the-type-file-and-line-number 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 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¶ https://docs.python.org/2.7/tutorial/errors.html 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, however, and result in error messages as shown here: >>> 10 * (1/0) Traceback (most recent call last): File "", line 1, in ZeroDivisionError: integer division or modulo 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: cannot concatenate 'str' and 'int' objects 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
you have probably seen some. There are (at least) two distinguishable kinds of errors: syntax errors and exceptions. 8.1. Syntax Errors¶ Syntax https://docs.python.org/3/tutorial/errors.html errors, also known as parsing errors, are perhaps the most common kind of complaint you 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 python exception 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 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. python error object 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, 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. T