Python读取文件并获取股票价格

Question

我正在使用一个叫做ystockquote的工具，你可以在这里找到它。简单来说，我有一个文件，里面记录了我所有的股票代码，然后我用Python来打开这个文件，并显示每只股票的价格。以下是我目前的代码：

import ystockquote 

def intro():
    # Here you enter the name of your file
    watchlist = raw_input(">")
    open_watchlist = open(watchlist)

   print "What next"
   next = raw_input(">")

   if next == "view":
        for line in open_watchlist:
             quote = ystockquote.get_price(line)
             print "%s: %s" % (line, quote)

intro()

但是我遇到了以下错误：

File "hi.py", line 16, in <module>
    intro()
  File "hi.py", line 13, in intro
    quote = ystockquote.get_price(line)
  File "/Users/Nawaz/plancials_beta/env/lib/python2.7/site-packages/ystockquote.py", line 67, in get_price
    return _request(symbol, 'l1')
  File "/Users/Nawaz/plancials_beta/env/lib/python2.7/site-packages/ystockquote.py", line 31, in _request
    resp = urlopen(req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 402, in open
    req = meth(req)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1113, in do_request_
    raise URLError('no host given')
urllib2.URLError: <urlopen error no host given>

有没有什么办法可以让我显示股票代码和价格呢？谢谢。

Answer 1

看起来你在倒数第二行把 quote 拼错了。 :)

不过说到这里：每次你打开一个资源，比如文件，完成后一定要记得把它关掉。最好的做法是使用 with open 这种写法，像这样：

def intro():
    watchlist = raw_input(">")
    with open(watchlist) as wl:
        print "What next"
        next = raw_input(">")

        if next == "view":
            for line in wl:
                quote = ystockquote.get_price(line)
                print "%s: %s" % (line, quote)

intro()

在 with open ... 这一行之后缩进的所有内容都是在打开的文件上进行操作的。当你离开这个代码块后，文件会自动关闭。