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 TypeError at /forum/ sequence item 10: expected string, NoneType
found  Request
Method: GET Request URL: http://127.0.0.1/forum/ Exception Type:
TypeError Exception
Value: sequence item 10: expected string, NoneType found Exception Location:
C:\Python24\lib\site-packages\django-
0.95.1-py2.4.egg\django\template\__init__.py in render_node, line 706

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from django import template



register = template.Library()



def calcPageRanges(cur_index, max_index):
    result = []

    if max_index <= 10:
        result.append(range(0, max_index + 1))
        return result

    c1 = cur_index - 3
    c2 = cur_index + 4
    if c1 <= 0:
        result.append(range(0, 7))
        result.append([max_index])
        return result
    else:
        result.append([0])

    if c2 > max_index:
        result.append(range(max_index -6, max_index + 1))
    else:
        result.append(range(c1, c2))
        result.append([max_index])

    return result


_state= 'Page'
_year = None
_month = None
_category_id = None

def getGlobalVars(context):
    global _state, _year, _month, _category_id

    try:
        _state= template.resolve_variable('state', context)
    except template.VariableDoesNotExist:
        _state= 'Page'

    if _state== 'Category':
        try:
            _category_id = template.resolve_variable('category_id', context)
        except template.VariableDoesNotExist:
            _category_id = None
    elif _state== 'Archive':
        try:
            _year = template.resolve_variable('year', context)
            _month = template.resolve_variable('month', context)
        except template.VariableDoesNotExist:
            _year = None
            _month = None


def pageRangeLink(cur_index, page_range):
    global _state, _year, _month, _category_id
    for n in page_range:
        if n != cur_index:
            if _state== 'Page':      #ÎÒÔÚʹÓÃʱ¾ÍÔÚ´Ë´¦£¬ÒÔ¼°ºóÐøµÄ¸÷¸öÏà¹ØλÖüÓÈë×Ô¼º¶¨ÒåÏ if
_state == 'forum':
                yield '%s'%(n, n)
            elif _state== 'Category':
                yield '%s'%(_category_id, n,
n)
            elif _state== 'Archive':
                yield '%s'%(_year, _month,
n, n)
        else:
            yield '%s'%(n)

def pagePrevLink(page_index):
    global _state, _year, _month, _category_id
    if _state== 'Page':
        return '«'%(page_index)
    elif _state== 'Category':
        return '«'%(_category_id, page_index)
    elif _state== 'Archive':
        return '«'%(_year, _month, page_index)

def pageNextLink(page_index):
    global _state, _year, _month, _category_id
    if _state== 'Page':
        return '»'%(page_index)
    elif _state== 'Category':
        return '»'%(_category_id, page_index)
    elif _state== 'Archive':
        return '»'%(_year, _month, page_index)


class PagebarNode(template.Node):
    def __init__(self, cur_index, max_index):
        self.curindex = cur_index
        self.maxindex = max_index

    def render(self, context):
        self.cur_index = template.resolve_variable(self.curindex, context)
        self.max_index = template.resolve_variable(self.maxindex, context)

        if self.max_index < 1: return ''

        getGlobalVars(context)

        pageRanges = calcPageRanges(self.cur_index, self.max_index)
        htmls = []
        htmls.append('
')

        if len(pageRanges) == 1:
            htmls.extend(pageRangeLink(self.cur_index, pageRanges[0]))
        else:
            i = 0
            e = len(pageRanges) - 1
            for pr in pageRanges:
                if (len(pr) == 1) and (i == 0):
                    htmls.append( pagePrevLink(self.cur_index-1) )
                htmls.extend(pageRangeLink(self.cur_index, pr))
                if i != e: htmls.append( '...' )
                if (len(pr) == 1) and (i != 0):
                    htmls.append( pageNextLink(self.cur_index+1) )
                i = i + 1

        htmls.append('
')
        return ''.join(htmls)



#class DoPagebar:
#    def __call__(self, parser, token):
#        tokens = token.contents.split()
#        if len(tokens) != 3:
#            raise template.TemplateSyntaxError, "%r tag requires 2
arguments" % tokens[0]
#        cur_index = tokens[1]
#        max_index = tokens[2]
#        return PagebarNode(cur_index, max_index)

def doPagebar(parser, token):
    tokens = token.contents.split()
    if len(tokens) != 3:
        raise template.TemplateSyntaxError, "%r tag requires 2 arguments" %
tokens[0]
    cur_index = tokens[1]
    max_index = tokens[2]
    return PagebarNode(cur_index, max_index)


# registration
register.tag('pagebar', doPagebar) #DoPagebar()

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