The page you scraped is rendered by JavaScript, requests and urllib can not handle JavaScript. I recommend you using selenium and BeautifulSoup to extract data.
This is when JavaScript is disabled:
the data you wanted is in this url :
http://financials.morningstar.com/ajax/ReportProcess4HtmlAjax.html?&t=XNAS:AAPL®ion=usa&culture=en-US&ops=clear&cur=&reportType=is&period=12&dataType=A&order=asc&columnYear=5&curYearPart=1st5year&rounding=3&view=raw&r=378724&callback=jsonp1482077238548&_=1482077239651
i put it in the bs4, you can get the data by you own:
import requests, bs4, json
r = requests.get('http://financials.morningstar.com/ajax/ReportProcess4HtmlAjax.html?&t=XNAS:AAPL®ion=usa&culture=en-US&ops=clear&cur=&reportType=is&period=12&dataType=A&order=asc&columnYear=5&curYearPart=1st5year&rounding=3&view=raw&r=378724&callback=jsonp1482077238548&_=1482077239651')
js = r.text.strip('jsonp1482077238548()')
html_str = json.loads(js)['result']
soup = bs4.BeautifulSoup(html_str, 'lxml')
out:
<html>
<body>
<div id="baseline" style="display:none">
<div>
156508000000
</div>
<div>
170910000000
</div>
<div>
182795000000
</div>
<div>
233715000000
</div>
<div>
215639000000
</div>
<div>
215639000000
</div>
</div>
<div class="left ">
<div class="r_xcmenu rf_table_left">
<div class="rf_header ">
<div class="lbl " currency="USD" fiscalyearend="September" fyenumber="9" id="unitsAndFiscalYear">
</div>
</div>
<div class="rf_crow1" id="label_i1" style="_height:16px; _float:none;">
<div class="lbl">
Revenue
</div>
<div class="chart_contain_free" id="chart_i1">
<div class="chart_icon">
</div>
</div>
</div>
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