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    String concatenation operator (+): String concatenation operator joins two or more strings
                        into one string.

                      Program 11 A program to demonstrate string concatenation.

                         Program11.py                                                      Output

                      File  Edit  Format   Run    Options   Window    Help              HelloWorld

                      str1 = 'Hello'
                      str2 = 'World'
                      print(str1 + str2)

                         String replication operator (*): The replication operator is used to repeat the string for a given
                        number of times.

                      Program 12 A program to demonstrate string repetition.

                         Program12.py                                                Output

                      File  Edit  Format   Run    Options   Window    Help        HelloHello
                                                                                  HelloHelloHelloHelloHello
                      str1 = 'Hello'
                      print(str1 * 2)
                      print(str1 * 5)

                     BUILT-IN STRING FUNCTIONS

                     Python offers a wide range of built-in functions for manipulating strings. Some built-in functions
                     are shown in the following table:

                        Functions                             Description                                 Syntax

                      count()         It returns the number of times a specified value occurs in  string.count(value)
                                      a string.
                      len()           It returns the total number of characters in the string.      len(string)

                      lower()         It converts a string into lower case.                         string.lower()
                      replace()       It returns a string where a specified value is replaced with  string.replace(old_
                                      a specified value.                                            value, new_value)

                      title()         It converts the first character of each word to uppercase.  string.title()

                      upper()         It converts a string into uppercase.                          string.upper()
                      capitalize()    It converts the first character of the string to uppercase.   string.capitalize()

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                                                                                                Step Ahead with Python

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