python date2num,文本文件mdates.strpdate2num错误

I keep getting an error using the numpy loadtxt converter.

Your help is greatly appreciated

import numpy as np

import time

import datetime

import matplotlib.pyplot as plt

import matplotlib.ticker as mticker

import matplotlib.dates as mdates

from matplotlib.finance import candlestick

from matplotlib.dates import strpdate2num

import urllib2

## global variables

eachStock = 'AAPL','GOOG','MSFT','AMZN','CMG'

for stock in eachStock:

stockFile = stock+'.txt'

date, closep, highp, lowp, openp, volume = np.loadtxt(eachStock, delimiter=',', unpack=True,

converters={ 0: mdates.strpdate2num('%Y%m%d')})

dFrame = Series(closep)

here is the first line in my text file

20040322,13.5200,13.6800,12.6100,12.6850,15850720

here is the error I keep getting

Traceback (most recent call last):

File "C:\Users\antoniozeus\Desktop\BuyAndHold.py", line 27, in

converters={ 0: mdates.strpdate2num('%Y%m%d')})

File "C:\Python27\lib\site-packages\numpy\lib\npyio.py", line 796, in loadtxt

items = [conv(val) for (conv, val) in zip(converters, vals)]

File "C:\Python27\lib\site-packages\matplotlib\dates.py", line 233, in __call__

return date2num(datetime.datetime(*time.strptime(s, self.fmt)[:6]))

File "C:\Python27\lib\_strptime.py", line 454, in _strptime_time

return _strptime(data_string, format)[0]

File "C:\Python27\lib\_strptime.py", line 325, in _strptime

(data_string, format))

ValueError: time data 'AAPL' does not match format '%Y%m%d'

解决方案

It seems like you mistyped stockFile (filename) as eachStock.

date, closep, highp, lowp, openp, volume = np.loadtxt(

stockFile, delimiter=',', unpack=True,

converters={ 0: mdates.strpdate2num('%Y%m%d')})