小编Rag*_*ine的帖子

我有一只熊猫df(见下文).我想添加一个名为"price"的列,我希望从使用函数派生值.我该怎么做呢？

function:

    def getquotetoday(symbol):
        yahoo = Share(symbol)
        return yahoo.get_prev_close()


df:

Symbol    Bid      Ask
MSFT     10.25   11.15
AAPL     100.01  102.54


  (...)

我正在使用pyalgotrade交易策略,我想在列表中使用多个代码.

它现在的设置方式,它为列表中的每个单独的股票代码运行策略,但我希望它做的是将它们全部作为一个复合策略运行.

我该怎么做呢？

这是代码:

    from pyalgotrade.tools     import yahoofinance
    from pyalgotrade           import strategy
    from pyalgotrade.barfeed   import yahoofeed
    from pyalgotrade.technical import stoch
    from pyalgotrade           import dataseries
    from pyalgotrade.technical import ma
    from pyalgotrade           import technical
    from pyalgotrade.technical import highlow
    from pyalgotrade           import talibext
    from pyalgotrade.talibext  import indicator
    import numpy as np
    import talib


    testlist = ['aapl', 'msft', 'z']

    class MyStrategy( strategy.BacktestingStrategy ):

        def __init__( self, feed, instrument ):
            strategy.BacktestingStrategy.__init__( self, feed )
            self.__position = []
            self.__instrument = instrument
            self.setUseAdjustedValues( True ) …

我试图找出如何打印以下列表,而不是从第一项开始.要清楚:如果列表是[0,1,2,3,4,5,6,7,8],我想打印类似的东西4,5,6,7,8,0,1,2,3

这是代码:

you_can_move_on = False

List = [0,1,2,3,4,5,6,7,8]

next_player = 3

while not you_can_move_on:
    next_player = self.get_next_player_index(next_player)
    you_can_move_on = self.check_if_I_can_move_on
    print(next_player)


def get_next_player_index(self, i):
    if i == len(self.players):
        return 0
    else:
        return i+1

def check_if_I_can_move_on(self):
    return False

我正试图从雅虎财经中提取数据.

这是我得到的错误:

File "banana.py", line 35, in <module>
    data = web.DataReader(ticker, "yahoo", datetime(2011,1,1), datetime(2015,12,31))
  File "C:\Users\ll\Anaconda2\lib\site-packages\pandas_datareader\data.py", line 94, in DataReader
    session=session).read()
  File "C:\Users\ll\Anaconda2\lib\site-packages\pandas_datareader\yahoo\daily.py", line 77, in read
    df = super(YahooDailyReader, self).read()
  File "C:\Users\ll\Anaconda2\lib\site-packages\pandas_datareader\base.py", line 173, in read
    df = self._read_one_data(self.url, params=self._get_params(self.symbols))
  File "C:\Users\ll\Anaconda2\lib\site-packages\pandas_datareader\base.py", line 80, in _read_one_data
    out = self._read_url_as_StringIO(url, params=params)
  File "C:\Users\ll\Anaconda2\lib\site-packages\pandas_datareader\base.py", line 91, in _read_url_as_StringIO
    response = self._get_response(url, params=params)
  File "C:\Users\ll\Anaconda2\lib\site-packages\pandas_datareader\base.py", line 117, in _get_response
    raise RemoteDataError('Unable to read URL: {0}'.format(url))
pandas_datareader._utils.RemoteDataError: Unable to read URL: http://ichart.finance.yahoo.com/table.csv

当我从.csv文件而不是代码列表中读取时出现错误: …

尝试使用漂亮的汤从网站上刮一张桌子来解析数据.我将如何通过其标题解析它？到目前为止,我甚至无法打印整张桌子.谢谢.

这是代码:

import urllib2
from bs4 import BeautifulSoup

optionstable = "http://www.barchart.com/options/optdailyvol?type=stocks"
page = urllib2.urlopen(optionstable)
soup = BeautifulSoup(page, 'lxml')

table = soup.find("div", {"class":"dataTables_wrapper","id": "options_wrapper"})

table1 = table.find_all('table')

print table1