How to find if a string contains another string

[Borse, Ganesh]

Hi,

Am new to python.
May someone please help me know this?

How can we check whether one big string contains another small string?

E.g. 
bigstring="python anaconda boa cobra"
smallone="boa"

If 0 == contains(bigstring,smallone):
        print "Yes, boa is snake.."

Is there any function like "contains" or "exists" in python?
What are different alternatives we have?

Please help.

Thanks and Regards,
Ganesh

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