Varsha Purohit wrote: > Hello, > i have again very basic question in python string management. > > I am not able to understand how find and index works and what do they > actually return. > >>>> line = "this is varsha" >>>> print line.find("is") > 2 >>>> print line.rfind("is") > 5 >>>> print line.rfind("varsha") > 8 >>>> print line.index("varsha") > 8 > > what does 2 in first line signifies... and why rfind gave 5 as an output... > > can anybody pls explain me what exactly is interpreter tryin to return..... > Sure. The 2 in first line means the string 'is' begins in line[2] that would be the 'is' in 'this' (remember line's first character 't' is line[0]). OTOH rfind looks for the first appearance of 'is' in line but starting from the right, that would be the word 'is' which starts at line[5]. As there is only one occurrence of 'varsha' in line both methods, find and rfind will give the same answer : 8.
>From Python 2.5 documentation : index( sub[, start[, end]]) Like find(), but raise ValueError when the substring is not found. HTH _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor