Some Homework Help

[alice.cooper.18659]

I am currently trying to pull high,low, and closing stock data from Yahoo finance, and graph it using Turtle. I was able to pull the data from the url into a list but I can't figure out how to graph it. I know the dates have to be the x-axis, and the values for high, low, and close data have to the Y-axis. I also know that high, low, and closing data have to be shown on three separate lines. Can anyone point me in the direction of how to do this?

def graphStock(symbol,start,end):

    highList = []
    lowList = []
    closeList= []
    dateList = []


    url01 = 'http://ichart.finance.yahoo.com/table.csv?s=%s&' % symbol + \
          'a=%s&' % str(int(start[4:6]) - 1) + \
          'b=%s&' % str(int(start[6:8])) + \
          'c=%s&' % str(int(start[0:4])) + \
          'd=%s&' % str(int(end[4:6]) - 1) + \
          'e=%s&' % str(int(end[6:8])) + \
          'f=%s&' % str(int(end[0:4])) + \
          'g=d&' + \
          'ignore=.csv'
    days = urllib.request.urlopen(url01).readlines()
    data = [bytes.decode(day).split(',') for day in days]


    for line in data[1:]:
        date = line[0]
        high = line[2]
        low = line[3]
        close = line[4]


        if line in data:
            dateList.append(date)
            highList.append(high)
            lowList.append(low)
            closeList.append(close)

    return graphStock

[slate]

1. Turtle graphic is not for plotting. see. If it is your homework, than forget it.
2. What is the reason you return the function object instead of the list?
3. I cannot run your code, because you did not provide a testcase. It is hard to help in that way.

4. See one simple example.

   import random
   import turtle

   data=[random.randint(1,100) for i in range(20)]

   for i in range(20):
   turtle.goto(i*20,data[i])

   a=input("Press any, to continue")

[alice.cooper.18659]

Well, the problem I am trying to do is :

Write a function that will graph the high,low, closing price for a stock. Your function should accept a beginning date and a end date, along with a ticker symbol for stock.

My professors only advice was to pull the data into a list, and then use turtle to do a line graph.

Not going to lie, I really don't know if I am even doing this problem right.

And the reason I returned the object, is because the point of the function is to return a graph, rather than a list. So I thought returning the list would not do what I am trying to do.

And here's the code with my Testcase.

import urllib.request
import cTurtle

# Functions

def graphStock(symbol,start,end):

    highList = []
    lowList = []
    closeList= []
    dateList = []


    url01 = 'http://ichart.finance.yahoo.com/table.csv?s=%s&' % symbol + \
          'a=%s&' % str(int(start[4:6]) - 1) + \
          'b=%s&' % str(int(start[6:8])) + \
          'c=%s&' % str(int(start[0:4])) + \
          'd=%s&' % str(int(end[4:6]) - 1) + \
          'e=%s&' % str(int(end[6:8])) + \
          'f=%s&' % str(int(end[0:4])) + \
          'g=d&' + \
          'ignore=.csv'
    days = urllib.request.urlopen(url01).readlines()
    data = [bytes.decode(day).split(',') for day in days]


    for line in data[1:]:
        date = line[0]
        high = line[2]
        low = line[3]
        close = line[4]


        if line in data:
            dateList.append(date)
            highList.append(high)
            lowList.append(low)
            closeList.append(close)

    return graphStock

# Main Tests

symb = 'APL'              
sDate = '20130201'
eDate = '20130322'


graphStock(symb,sDate,eDate)

[slate]

And the reason I returned the object, is because the point of the function is to return a graph, rather than a list. So I thought returning the list would not do what I am trying to do.

You return the function, not a graph.
Do you need a picture, or only a program that draws a graph?

What is the problem with my code? It accepts a list, and draws a graph.

Please read: http://docs.python.org/release/2.7/library/turtle.html
or
http://docs.python.org/3.3/library/turtle.html?highlight=turtle#turtle
Depending on your python version.

Watch this, too.

[alice.cooper.18659]

Nothing's wrong with your code, but when I try to use it with my lists it just gives me a straight line.
I wonder if has to do with my data values?

[slate]

I have looked at the highList. All values are near 33. No wonder that you see a straight line.
You have to shift the horizontal axis and zoom in.

    shift=-33
    zoom=50
    for i in range(len(highList)):
        turtle.goto(i*20,(float(highList[i])+shift)*zoom)

[alice.cooper.18659]

This works! Thanks for your help!