#### $oh->add( 'a', 5 ); # like $oh{a} += 5 $oh->concat( 'a', 'hello' ); # like $oh{a} .= 'hello' #### >>> h = {'a' : 1} >>> h['a'] += 2 >>> h {'a': 3} >>> >>> from collections import OrderedDict >>> oh = OrderedDict(h) >>> oh OrderedDict([('a', 3)]) >>> oh['a'] += 2 >>> oh OrderedDict([('a', 5)]) >>> oh['b'] = 'hello' >>> oh['b'] += ' world' >>> oh OrderedDict([('a', 5), ('b', 'hello world')])