python输入两个操作数和一个操作符_一元+的错误操作数类型：“str”

我想不出用Python2.7编写的代码有什么问题。我正在将引用转换为int，但是我一直得到一个类型异常bad operand type for unary +: 'str'。有人能帮忙吗？import urllib2

import time

import datetime

stocksToPull = 'EBAY', 'AAPL'

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=3y/csv'

saveFileLine = stock + '.txt'

try:

readExistingData = open(saveFileLine, 'r').read()

splitExisting = readExistingData.split('\n')

mostRecentLine = splitExisting[-2]

lastUnix = mostRecentLine.split(',')[0]

except Exception, e:

print str(e)

time.sleep(1)

lastUnix = 0

saveFile = open(saveFileLine, 'a')

sourceCode = urllib2.urlopen(urlToVisit).read()

splitSource = sourceCode.split('\n')

for eachLine in splitSource:

if 'values' not in eachLine:

splitLine = eachLine.split(',')

if len(splitLine) == 6:

if int(splitLine[0]) > int(lastUnix):

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(120)

except Exception, e:

print 'main loop', str(e)

for eachStock in stocksToPull:

pullData(eachStock)

当操作数异常到达if int(splitLine[0]) > int(lastUnix):时，我正在命中操作数异常bad operand type for unary +: 'str'，即使两个被比较的值在测试时都打印为int。有人能给我一些反馈吗？谢谢您！

以下是异常响应：Currently pulling EBAY

2013-12-21 11:32:40

Pulled main loop bad operand type for unary +: 'str'

Currently pulling AAPL

2013-12-21 11:32:41

Pulled main loop bad operand type for unary +: 'str'`