elif tmpl == 'yx_tuple:pos':
args += [self.parse_yx_tuple(arg, 'pos')]
elif tmpl == 'seq:int:nonneg':
+ if arg == ',':
+ args += [[]]
+ continue
sub_tokens = arg.split(',')
if len(sub_tokens) < 1:
raise ArgError('Argument must be non-empty sequence.')