strings concatenation and repetition the operators and can be used on strings the operator combines two strings this operation is called concatenation the repeats string certain number of times here are some examples expression result 'ab'+'cd'abcd' '+' '+' ' 'hi'* 'hihihihiexample if we want to print long row of dasheswe can do the following print''* example the operator can be used to build up stringpiece by pieceanalogously to the way we built up counts and sums in sections and here is an example that repeatedly asks the user to enter letter and builds up string consisting of only the vowels that the user entered 'for in range( ) input'enter letter'if =' or =' or =' or =' or =' ' print(sthis technique is very useful the in operator the in operator is used to tell if string contains something for exampleif ' in stringprint'your string contains the letter 'you can combine in with the not operator to tell if string does not contain somethingif 'not in stringprint'your string does not contain any semicolons 'example in the previous section we had the long if condition if =' or =' or =' or =' or =' 'using the in operatorwe can replace that statement with the followingif in 'aeiou '