Function isSubstring

python/Chapter 1/Question1_8/ChapQ1.8.py:5–6

(s1,s2)

#a rotation of s1 using only one call to isSubstring (e.g.,"waterbottle" is a rotation of "erbottlewat").

def isSubstring(s1,s2):
    return s1.find(s2) > -1

def rotatedStringHasSubstring(s1,s2):
    #doubling the string ensures a complete substring regardless of rotation