错误：主循环只能将元组(而不是"str")连接到元组

Question

基本上是尝试修改本教程的货币而不是股票： http://pythonprogramming.net/advanced-matplotlib-graphing-charting-tutorial/

使用我当前的代码，我得到：

Error: main loop can only concatenate tuple (not "str") to tuple

代码：

import urllib2
import time

CurrencysToPull = 'audusd','eurusd','usdcad'
def pullData(Currency):
    try:
        fileline = Currency+'.txt'
        urlToVisit = 'http://finance.yahoo.com/echarts?s=Currency=X#{"allowChartStacking":true}/'+Currency+'/chartdata;type=quote:range=1y/csv'
        sourcecode = urllib2.urlopen(urlToVisit).read()
        splitSource = sourcecode.split('n')
        for eachLine in splitSource:
            splitLine = eachLine.split(',')
            if len(splitLine)==6:
                if 'valuse' not in eachLine:
                    saveFile = open(fileLine,'a')
                    lineToWrite = eachLine+'n'
                    saveFile.write(lineToWrite)
        print 'Pulled', Currency
        print 'sleeping'
        time.sleep(1)
    except Exception,(e):
        print('main loop'), str(e)
for eachStock in CurrencysToPull:
    pullData(CurrencysToPull)

Answer 1

你正在将CurrencysToPull元组传递给你的函数：

for eachStock in CurrencysToPull:
    pullData(CurrencysToPull)

然后尝试将字符串连接到：

fileline = Currency+'.txt'

您可能打算传入eachStock：

for eachStock in CurrencysToPull:
    pullData(eachStock)

Answer 2

错误在此行中： fileline = Currency+'.txt'货币是一个元组，.txt是一个字符串

在你的for循环中，你传递的是CurrencysToPull而不是每个股票。它应该是：

for eachStock in CurrencysToPull:

在异常处理中使用回溯可以获得有关错误的更好信息。

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