The pandas module can retrieve econometric data from various websites on the Internet. The types of data that can be downloaded varies from stock prices and option prices to macroeconomic data. The websites in question are listed as follows:
Yahoo! Finance at http://finance.yahoo.com/
Google Finance at https://www.google.com/finance
Federal Reserve Economic Data at http://research.stlouisfed.org/fred2/
Kenneth R. French - Data Library at http://mba.tuck.dartmouth.edu/pages/faculty/ken.french/data_library.html
World Bank Group at http://www.worldbank.org/
It's quite possible that you are not interested in all of this econometric data; therefore, in this section, we will only download option data from Yahoo! Finance with the purpose of calculating the price of a straddle.