Python clean way to wrap individual statements in a try except block

Question

I\'m currently doing some Python automation of Excel with com. It\'s fully functional, and does what I want, but I\'ve discovered something surprising. Sometimes, some of th

Answer 1

This just wraps functions calls, but you can extend it to handle attribute access as well, and to proxy the results of nested attribute accesses, finally just wrapping the __setattr__ in your try:except block.

It might be sensible to swallow only some specific exception types in your case (as @vsekhar says).

def onErrorResumeNext(wrapped):
    class Proxy(object):
        def __init__(self, fn):
            self.__fn = fn

        def __call__(self, *args, **kwargs):
            try:
                return self.__fn(*args, **kwargs)
            except:
                print "swallowed exception"

    class VBWrapper(object):
        def __init__(self, wrapped):
            self.wrapped = wrapped

        def __getattr__(self, name):
            return Proxy(eval('self.wrapped.'+name))

    return VBWrapper(wrapped)

Example:

exceptionProofBorders = onErrorResumeNext(excel.Selection.Borders)
exceptionProofBorders(xlDiagonalDown).LineStyle = xlNone
exceptionProofBorders(xlDiagonalup).LineStyle = xlNone