43

我无法弄清楚我在使用 Python 2.7 编写的代码时遇到的问题。我正在将引用转换为整数，但我不断收到类型异常bad operand type for unary +: 'str'。有人可以帮忙吗？

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)

即使在测试时比较的两个值都打印为整数，bad operand type for unary +: 'str'我也会遇到操作数异常。if int(splitLine[0]) > int(lastUnix):谁能给我一些反馈？谢谢你！

这是异常响应：

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'`
4

2 回答 2

44

你说这if int(splitLine[0]) > int(lastUnix):造成了麻烦，但你实际上并没有表现出任何暗示这一点的东西。我认为这条线是问题所在：

print 'Pulled', + stock

你明白为什么这条线会导致错误信息吗？你想要要么

>>> stock = "AAAA"
>>> print 'Pulled', stock
Pulled AAAA

或者

>>> print 'Pulled ' + stock
Pulled AAAA

不是

>>> print 'Pulled', + stock
PulledTraceback (most recent call last):
  File "<ipython-input-5-7c26bb268609>", line 1, in <module>
    print 'Pulled', + stock
TypeError: bad operand type for unary +: 'str'

您要求 Python 将该+符号应用于一个字符串，例如+23使 23 为正数，而她反对。

于 2013-12-21T16:52:37.087 回答
13

该代码对我有用。（添加缺失except的子句/import语句后）

你有没有\输入原始代码？

urlToVisit = 'http://chartapi.finance.yahoo.com/instrument/1.0/' \
              + stock + '/chartdata;type=quote;range=5d/csv'

如果您省略它，则可能是导致异常的原因：

>>> stock = 'GOOG'
>>> urlToVisit = 'http://chartapi.finance.yahoo.com/instrument/1.0/'
>>> + stock + '/chartdata;type=quote;range=5d/csv'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: bad operand type for unary +: 'str'

顺便说一句，string(e)应该是str(e)。

于 2013-12-15T05:16:07.817 回答