此代码直接来自Whoosh的quickstart docs：
import os.path
from whoosh.index import create_in
from whoosh.fields import Schema, STORED, ID, KEYWORD, TEXT
from whoosh.index import open_dir
from whoosh.query import *
from whoosh.qparser import QueryParser
#establish schema to be used in the index
schema = Schema(title=TEXT(stored=True), content=TEXT,
path=ID(stored=True), tags=KEYWORD, icon=STORED)
#create index directory
if not os.path.exists("index"):
os.mkdir("index")
#create the index using the schema specified above
ix = create_in("index", schema)
#instantiate the writer object
writer = ix.writer()
#add the docs to the index
writer.add_document(title=u"My document", content=u"This is my document!",
path=u"/a", tags=u"first short", icon=u"/icons/star.png")
writer.add_document(title=u"Second try", content=u"This is the second example.",
path=u"/b", tags=u"second short", icon=u"/icons/sheep.png")
writer.add_document(title=u"Third time's the charm", content=u"Examples are many.",
path=u"/c", tags=u"short", icon=u"/icons/book.png")
#commit those changes
writer.commit()
#identify searcher
with ix.searcher() as searcher:
#specify parser
parser = QueryParser("content", ix.schema)
#specify query -- try also "second"
myquery = parser.parse("is")
#search for results
results = searcher.search(myquery)
#identify the number of matching documents
print len(results)
我只是将一个值 - 即动词“is” - 传递给parser.parse（）调用。然而，当我运行它时，我得到长度为零的结果，而不是长度为2的预期结果。如果我将“is”替换为“second”，我会得到一个结果，如预期的那样。为什么使用“is”的搜索不会产生匹配？
正如@Philippe指出的那样，默认的Whoosh索引器会删除停用词，因此会出现上述行为。如果要保留停用词，可以在索引索引指定字段时指定要使用的分析器，并且可以向分析器传递一个参数，以避免删除停用词; e.g：
schema = Schema(title=TEXT(stored=True, analyzer=analysis.StandardAnalyzer(stoplist=None)))