Why is sys.excepthook not working?
Why is the function not being called sys.excepthook
if I try to execute this code?
import sys;
def MyExcepthook(ex_cls, ex, tb):
print("Oops! There an Error.\n");
a=open("./ERR.txt","w"); #Fixed as suggested by unutbu BUT the problem is the same!
a.write("Oops! There an Error.\n");
a.close();
sys.excepthook = MyExcepthook;
def main():
print(1/0);
if (__name__=="__main__"):
main();
Output:
Traceback (most recent call last):
File "C:\Users\Path\to\my\python\file.py", line 13, in <module>
main();
File "C:\Users\Path\to\my\python\file.py", line 10, in main
print(1/0);
ZeroDivisionError: division by zero
Expected Output (on print
):
Oops! There an Error.
and a new file ( Err.txt
) should be created ( open
)
The function print
does not display text and the file is not created because the function is sys.excepthook
not called - why?
-> EDIT My problem is caused by a bug in idle-python 3.4 because now I was trying to run the code with the python interpreter (command line) and it works! this makes my question useless without warning about this error in idle-python 3.4. Sorry and thanks for your help!
[SOLUTION] if anyone has my problem => Try running code on command line! not from the IDE.
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Your custom excepthook shouldn't throw an exception itself:
a=open("./ERR.txt") # opens the file in read mode
it should be
a=open("./ERR.txt", 'w') # open the file in write mode.
When a custom excepthook throws an exception, you should see something like
Oops! There an Error.
Error in sys.excepthook:
...
IOError: [Errno 2] No such file or directory: './ERR.txt'
Original exception was:
...
ZeroDivisionError: integer division or modulo by zero
PS. Don't forget to remove any extra semicolons!
import sys
def my_excepthook(ex_cls, ex, tb):
msg = "Oops! There an Error.\n"
print(msg)
with open("./ERR.txt", 'w') as a:
a.write(msg)
sys.excepthook = my_excepthook
def main():
print(1/0)
if __name__=="__main__":
main()
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