Catch exceptions with context managers

gistfile1.py

class ExceptionCatcher():

    def __enter__(self):
        self.msg = None

    def __exit__(self, type, value, traceback):
        if type is Exception:
            self.msg = value
        
        return True # if you return a truthy value then the exception isn't raised

exception_catcher = ExceptionCatcher()
with exception_catcher:
    raise Exception("hello world")

print exception_catcher.msg