@register.filter def is_in(value, arg): '''It performs the same action as Python in statement. It returns True if value is in arg, False if not or any error occur. For example: {{ 'abc'|is_in:'www.abc.com'}} -> 'abc' in 'www.abc.com' x = 5 l = [3,4,5,6] {{ x|is_in:l} -> x in l ''' try: return value in arg except: return False