python - 主循环 'builtin_function_or_method' 对象不可迭代

Question

当我运行下面的代码时，我得到这个错误“main loop 'builtin_function_or_method' object is not iterable”:

我有搜索 stackoverflow，但找不到我的问题的答案...

我检查了拼写错误，但找不到任何错误。请帮助我!

import urllib2
import time
import datetime

stocksToPull = 'AAPL','GOOG','MSFT','CMG','AMZN','EBAY','TSLA'

def pullData(stock):
    try:
        print 'Currently pulling',stock
        print str(datetime.datetime.fromtimestamp(time.time()).strftime('%Y-%m-%d %H:%M:%S'))
        urlToVisit = 'http://chartapi.finance.yahoo.com/instrument/1.0/'+stock+'/chartdata;type=quote;range=5d/csv'
        saveFileLine = stock+'.txt'

        try:
            readExistingData = open(saveFileLine,'r').read()
            splitExisting = readExistingData.split('\n')
            mostRecentLine = splitExisting[-2]
            lastUnix = mostRecentLine.split(',')[0]
        except:
            lastUnix = 0

        saveFile = open(saveFileLine,'a')
        sourceCode = urllib2.urlopen(urlToVisit).read()
        splitSource = sourceCode.split

        for eachLine in splitSource:
            splitLine = eachLine.split(',')
            if len(splitLine) ==6:
                if splitLine[0] > lastUnix:
                    if 'values' not in eachLine:
                        lineToWrite = eachLine+'\n'
                        saveFile.write(lineToWrite)

        saveFile.close()

        print 'Pulled',stock
        print 'sleeping...'
        print str(datetime.datetime.fromtimestamp(time.time()).strftime('%Y-%m-%d %H:%M:%S'))
        time.sleep(300)

    except Exception,e:
        print 'main loop',str(e)

for eachStock in stocksToPull:
    pullData(eachStock)

Answer 1

直接回答

这里的代码:

saveFile = open(saveFileLine,'a')
sourceCode = urllib2.urlopen(urlToVisit).read()
splitSource = sourceCode.split

将 sourceCode.split 更改为 sourceCode.split()。

---

如果您想了解有关此错误的更多信息，请阅读以下内容:

调试时，你最好删除 try...except block ，尤其是“expect Exception” block ，它太通用了，你会不知道哪里出错了。

当删除 try...except block 并再次运行这些代码时，您将得到如下错误信息:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-c4fe20f718cd> in <module>()
     43 
     44 for eachStock in stocksToPull:
---> 45     pullData(eachStock)

<ipython-input-5-c4fe20f718cd> in pullData(stock)
     23     splitSource = sourceCode.split
     24 
---> 25     for eachLine in splitSource:
     26         splitLine = eachLine.split(',')
     27         if len(splitLine) ==6:

TypeError: 'builtin_function_or_method' object is not iterable

错误消息 TypeError: 'builtin_function_or_method' object is not iterable 与第 25 行相关联，这意味着 splitSource 是一个 builtin_function_or_method 并且是不是可迭代的。

什么是splitSource？它是 sourceCode.split。答案来了。您应该使用 () 调用方法，否则您将获得方法本身。 str.split 方法显然不是iterable!