Unfortunately, no, there is no such way to do by default. However you can provide it defaultdict or object with overridden __getattr__, and use like this:
class SafeFormat(object):
def __init__(self, **kw):
self.__dict = kw
def __getattr__(self, name):
if not name.startswith('__'):
return self.__dict.get(name, '')
print "i am an {0.error} example string {0.error2}".format(SafeFormat(hello=2,error2="success"))
i am an example string success
