既存のシェルフからキーと値のペアを読み取って、更新されたフィールドを持つ新しいクラス オブジェクトを作成し、そのクラス オブジェクトを新しいシェルフに書き込もうとしています。私のクラスオブジェクト：SongDetails
これは失敗する手順です:
def updateShelfWithTabBody(shelfFileName, newShelfFileName):
"""this function updates songDetails with
html body i.e. just the part that contains lyrics and
chords in the tab """
#read all songDetails
shelf = shelve.open(shelfFileName)
listOfKeys = shelf.keys()
#create new songDetails object
temporaryShelfObject = SongDetails.SongDetails()
#iterate over list of keys
for key in listOfKeys:
#print "name:"+shelf[key].name
#fill details from temporaryShelfObject
temporaryShelfObject.name = shelf[key].name
temporaryShelfObject.tabHtmlPageContent = shelf[key].tabHtmlPageContent
#add new detail information
htmlPageContent = shelf[key].tabHtmlPageContent
temporaryShelfObject.htmlBodyContent = extractDataFromDocument.fetchTabBody(htmlPageContent)
#write SongDetails back to shelf
writeSongDetails.writeSongDetails(temporaryShelfObject, newShelfFileName)
上記のコードで使用される関数の定義:
def fetchTabBody(page_contents):
soup = BeautifulSoup(page_contents)
HtmlBody = ""
try:
#The lyrics and chords of song are contained in div with id = "cont"
#Note: This assumtption is specific to ultimate-guitar.com
HtmlBody = soup.html.body.find("div",{"id":"cont"})
except:
print "Error: ",sys.exc_info()[0]
return HtmlBody
def writeSongDetails(songDetails, shelfFileName):
shelf = shelve.open(shelfFileName)
songDetails.name = str(songDetails.name).strip(' ')
shelf[songDetails.name] = songDetails
shelf.close()
SongDetails クラス:
class SongDetails:
name = ""
tabHtmlPageContent = ""
genre = ""
year = ""
artist = ""
chordsAndLyrics = ""
htmlBodyContent = ""
scale = ""
chordsUsed = []
これは私が得るエラーです:
Traceback (most recent call last):
File "/l/nx/user/ndhande/Independent_Study_Project_Git/Crawler/updateSongDetailsShelfWithNewAttributes.py", line 69, in <module>
updateShelfWithTabBody(shelfFileName, newShelfFileName)
File "/l/nx/user/ndhande/Independent_Study_Project_Git/Crawler/updateSongDetailsShelfWithNewAttributes.py", line 38, in updateShelfWithTabBody
writeSongDetails.writeSongDetails(temporaryShelfObject, newShelfFileName)
File "/home/nx/user/ndhande/Independent_Study_Project_Git/Crawler/writeSongDetails.py", line 7, in writeSongDetails
shelf[songDetails.name] = songDetails
File "/usr/lib64/python2.6/shelve.py", line 132, in __setitem__
p.dump(value)
File "/usr/lib64/python2.6/copy_reg.py", line 71, in _reduce_ex
state = base(self)
File "/u/ndhande/.local/lib/python2.6/site-packages/BeautifulSoup.py", line 476, in __unicode__
return str(self).decode(DEFAULT_OUTPUT_ENCODING)
**RuntimeError: maximum recursion depth exceeded**
コードに明示的な再帰呼び出しがないにもかかわらず、このエラーが発生する理由が見つかりませんでした。他のスタックオーバーフローの投稿でこのエラーを見たことがありますが、その場合は再帰呼び出しがありました。