Question

尝试使用API打印Yahoo搜索结果时，For循环计数器不会打印其递增值。解析并打印XML，但计数器反复打印“1”。

相同的代码适用于Bing API。

for counter1 in range(50):
    try:
        for Result in YahooSearchResultsXML.getElementsByTagName('Result'):
            try:
                Yahoo_PageTitle = Result.getElementsByTagName('Title')[counter1].firstChild.toxml(encoding="utf-8")
            except AttributeError:
                Yahoo_PageTitle = "Sorry, no page title provided..." 
            try:
                Yahoo_PageDesc = Result.getElementsByTagName('Summary')[counter1].firstChild.toxml(encoding="utf-8")
            except AttributeError:
                Yahoo_PageDesc = "Sorry, no page description provided..."
            Yahoo_DisplayURL = Result.getElementsByTagName('DisplayUrl')[counter1].firstChild.toxml(encoding="utf-8")
            Yahoo_URL = Result.getElementsByTagName('ClickUrl')[counter1].firstChild.toxml(encoding="utf-8")
            ##  Print the output to ensure it's working.
            print counter1+1
            print "<br />"
            print "<h2>" + Yahoo_PageTitle + "</h2>"
            print Yahoo_PageDesc + "<br />"
            print Yahoo_DisplayURL + "<br />"
            print Yahoo_URL + "<br />"
            print "<p> ----------------------------------------------------------------------------------------------------------------- </p>"
    except IndexError:
        print "Exiting@IndexError handler"
        break
    Yahoo_Score = counter1 + 1

建议赞赏，现在看这段代码已经太久了。

Answer 1

如上所述，打印在for Result in..循环中。如果您有多重结果，则会获得具有相同内容的多行。

~~此外，try不应缩进？~~（已修复）

编辑：从我们收集的信息中，您需要在内部循环中递增该计数器。你写它的方式（for counter1 in range(50)）会在外循环中增加它。

试试这个（注意身份变化）：

    counter1 = 0
    try:
        for Result in YahooSearchResultsXML.getElementsByTagName('Result'):
            try:
                Yahoo_PageTitle = Result.getElementsByTagName('Title')[counter1].firstChild.toxml(encoding="utf-8")
            except AttributeError:
                Yahoo_PageTitle = "Sorry, no page title provided..." 
            try:
                Yahoo_PageDesc = Result.getElementsByTagName('Summary')[counter1].firstChild.toxml(encoding="utf-8")
            except AttributeError:
                Yahoo_PageDesc = "Sorry, no page description provided..."
            Yahoo_DisplayURL = Result.getElementsByTagName('DisplayUrl')[counter1].firstChild.toxml(encoding="utf-8")
            Yahoo_URL = Result.getElementsByTagName('ClickUrl')[counter1].firstChild.toxml(encoding="utf-8")
            ##  Print the output to ensure it's working.
            print counter1+1
            counter1 += 1
            print "<br />"
            print "<h2>" + Yahoo_PageTitle + "</h2>"
            print Yahoo_PageDesc + "<br />"
            print Yahoo_DisplayURL + "<br />"
            print Yahoo_URL + "<br />"
            print "<p> ----------------------------------------------------------------------------------------------------------------- </p>"
    except IndexError:
        print "Exiting@IndexError handler"
        break
    Yahoo_Score = counter1 + 1

Answer 2

您确定每个Title中有多个Summary / DisplayUrl / ClickUrl / Result？当计数器的值达到1时，如果XML中某处没有第二个Title / etc元素，您将跳转到IndexError处理程序并退出循环。

Python CGI Script（使用XML＆amp; mindom）不打印FOR循环计数器

2 个答案: