Access to database other web sites

[Jenny]

I am doing research about realationship between sales rates and
discounted prices or recommendation frequency. To do this, I need to
access the database of commercial web sites via internet. I think this
is possible because it it simmilar to the work of price comparison
sites and web robot.

I am studying python these days because I thinks it is a good language
for the work. Actually I am a novice at python.

I welcome any informaion about this problem. Thanks in advance.