NameError: name 'of class' is not defined

Question

我写了一个 class（搜索器）用于在数据库中搜索一串单词但是当我想执行我的脚本时我得到这个错误：

NameError: name 'searcher' is not defined

我的代码：

class searcher:
    def __init__(self, dbname):
        self.con = sqlite3.connect(dbname)

    def __del__(self):
        self.con.close()

    def getmatchrows(self,q):
        fieldlist = 'w0.urlid'
        tablelist = ''
        clauselist = ''
        words = q.split(' ')
        tablenumber = 0
        wordids = []

        for word in words:
            wordrow = self.con.execute("select rowid from wordlist where word = '%s'" %word).fetchone()
            if wordrow !=None:
                wordid = wordrow[0]
                wordids.append(wordid)
                if tablenumber > 0:
                    tablelist+=','
                    clauselist+=' and '
                    clauselist+='w%d.urlid=w%d.urlid and ' % (tablenumber -1, tablenumber)
                fieldlist+=',w%d.location'% tablenumber
                tablelist+='wordlocation w%d'% tablenumber
                clauselist+='w%d.wordid = %d' % (tablenumber,wordid)
                tablenumber+=1

        query = 'select %s from %s where %s' % (fieldlist,tablelist,clauselist)
        cur = self.con.execute(query)
        rows = [row for row in cur]

        return rows,wordids

    wordsearch = searcher('searchindex.db')
    print  wordsearch.getmatchrows('indie music')

我哪里做错了？！！

Answer 1

代码的最后两行是缩进的，因此它们属于 class searcher: 块。但是，searcher class 直到此块结束后才存在，因此尝试在 wordsearch = searcher('searchindex.db') 中引用 searcher 失败。

取消最后两行的缩进。

NameError: name 'of class' is not defined

NameError: name 'of class' is not defined

python

nameerror