Python: How to ignore an exception and proceed?

Python: How to ignore an exception and proceed?

except Exception:
    pass

Python docs for the pass statement

Generic answer

The standard nop in Python is the pass statement:

try:
    do_something()
except Exception:
    pass

Using except Exception instead of a bare except avoid catching exceptions like SystemExit, KeyboardInterrupt etc.

Python 2

Because of the last thrown exception being remembered in Python 2, some of the objects involved in the exception-throwing statement are being kept live indefinitely (actually, until the next exception). In case this is important for you and (typically) you dont need to remember the last thrown exception, you might want to do the following instead of pass:

try:
    do_something()
except Exception:
    sys.exc_clear()

This clears the last thrown exception.

Python 3

In Python 3, the variable that holds the exception instance gets deleted on exiting the except block. Even if the variable held a value previously, after entering and exiting the except block it becomes undefined again.

Python: How to ignore an exception and proceed?

Theres a new way to do this coming in Python 3.4:

from contextlib import suppress

with suppress(Exception):
  # your code

Heres the commit that added it: http://hg.python.org/cpython/rev/406b47c64480

And heres the author, Raymond Hettinger, talking about this and all sorts of other Python hotness (relevant bit at 43:30): http://www.youtube.com/watch?v=OSGv2VnC0go

If you wanted to emulate the bare except keyword and also ignore things like KeyboardInterrupt—though you usually dont—you could use with suppress(BaseException).

Edit: Looks like ignored was renamed to suppress before the 3.4 release.

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