Strings and list in python
Strings: If alphanumeric characters are enclosed in single or double quotation marks, it indicates a string. For example, S1='hello' S2='hai' Print (type (S1)) #and your output will be str Indexing: It is used to extract a single character from a string. For example, S='hello' print (S[1]) #and your output will be e #e is present in the location given in input Slicing: It is used for printing a subset of the string. For example, S='Good day' print (S[0:3]) #and your output will be Goo #the characters present from 0th to 2nd(n-1) position is printed Other functions: 1)len(S) -Used to find the length of the string .i.e.the number of characters in the string. 2)lower(S) -Used to print the string in lower case. 3)upper (S) -Used to print the string in upper case. 4)replace (S) -Used to replace the characters in a string. Sample problems: Problem-1 To reverse a string Input S='Good day' k=S[::-1] print (k) # here S[-1]=y Output yad dooG Problem-2 T