Miscellany

class IfEqualCastNode(template.Node):    '''    Like {% ifequal %} but casts strings to ints for integer comparison; used mostly in loops comparing loop counter     to a value which might be a string.    '''    def __init__(self, var1, var2, nodelist_true, nodelist_false, negate):        self.var1, self.var2 = var1, var2        self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false        self.negate = negate    def __repr__(self):        return "<IfEqualNode>"    def render(self, context):        val1 = template.resolve_variable(self.var1, context)        val2 = template.resolve_variable(self.var2, context)        if val1 is not None and val1 != "": val1 = int(val1)        if val2 is not None and val2 != "": val2 = int(val2)        if (self.negate and val1 != val2) or (not self.negate and val1 == val2): return self.nodelist_true.render(context)        return self.nodelist_false.render(context)def ifequalcast(parser, token, negate):    bits = token.contents.split()    if len(bits) != 3:        raise template.TemplateSyntaxError, "%r takes two arguments" % bits[0]    end_tag = 'end' + bits[0]    nodelist_true = parser.parse(('else', end_tag))    token = parser.next_token()    if token.contents == 'else':        nodelist_false = parser.parse((end_tag,))        parser.delete_first_token()    else: nodelist_false = template.NodeList()    return IfEqualCastNode(bits[1], bits[2], nodelist_true, nodelist_false, negate)register.tag('ifequalcast', lambda parser, token: ifequalcast(parser, token, False))