Question

我有这段代码，

    try:
        print "what"
        newClassName = CourseNameAndCodeAssociation.objects.get(departmentCode__iexact =         nameAndNumberStore[0])
        print newClassName  
    except:
        print "HAHA"

这总是打印“HAHA”，尽管事实上我在控制台中运行newClassName = ...代码并且它有效。

为什么会这样？

修改

def newGetAllInformation(searchTerm):
nameAndNumberStore = modifySearchTerm(searchTerm)
urlStore = modifyUrl(nameAndNumberStore) # need to make the change here -- why not I go to the site, check for Course name - if that is not there switch, if it is  then scrape 
soup = getHtml(urlStore) 
storeOfBooks = []
storeOfBooks = scrape(soup,nameAndNumberStore)
print nameAndNumberStore[0]
try:
    newClassName = CourseNameAndCodeAssociation.objects.get(departmentCode__iexact = nameAndNumberStore[0])
    nameAndNumberStore = modifySearchTerm(newClassName.departmentName + " " + nameAndNumberStore[1])
    urlStore = modifyUrl(nameAndNumberStore)
    soup = getHtml(urlStore)
    storeOfBooks = scrape(soup,nameAndNumberStore)

except:
    print "HAHA"

return storeOfBooks

修改经过进一步的调查 - 也就是说，手动输入一个有效的代码（有效），我认为从阵列中获取代码有一些东西 - 尽管两者都是相同的数据类型（字符串）。

所以newClassName = CourseNameAndCodeAssociation.objects.get(departmentCode__iexact = "econ")适用于文件，newClassName = CourseNameAndCodeAssocition.objects.get(departmentCode__iexact = nameAndNumberStore[0])，其中nameAndNumberStore[0]包含 econ

Answer 1

请修改代码，运行它并告诉我们您获得的异常：

try:
    print "what"
    newClassName = CourseNameAndCodeAssociation.objects.get(departmentCode__iexact =         nameAndNumberStore[0])
    print newClassName  
except Exception as e:
    print "HAHA"
    print e

此外，在您的盒子上安装调试器可能会有所帮助。我可以推荐Eclipse与PyDev结合使用，但这是个人选择。那里有很多很棒的选择。

Eclipse IDE - download the basic Java version of 120MB

then install this plugin on top of it - Pydev

Answer 2

将其更改为：

except CourseNameAndCodeAssociation.DoesNotExist:

您创建的每个模型都会获得自己的DoesNotExist异常，从而扩展核心ObjectDoesNotExist异常。

同样最好的方法是仅在您希望失败的精确线周围使用try ... except。写一个更加pythonic的方式来写你所拥有的东西：

department_code = name_and_number_store[0]
class_names = CourseNameAndCodeAssociation.objects.all()
try:
    new_class_name = class_names.get(departmentCode__iexact=department_code)
except CourseNameAndCodeAssociation.DoesNotExist:
    print "HAHA"
else:
    search_term = u'%s %s' % (new_class_name.departmentName,
                              name_and_number_store[1])
    name_and_number_store = modify_search_term(search_term)
    url_store = modify_url(name_and_number_store)
    soup = get_html(url_store)
    store_of_books = scrape(soup, name_and_number_store)

请注意，Python中的约定是对变量，属性和函数名使用lowercase_underscored_names，对类名使用CamelCaseNames（实例名称是变量或属性）。

Django尝试除了不工作

2 个答案: