Write a Python function midChars() that gets a string as parameter and returns the middle character(s) of a string. Note: a) If the length of the string is odd there will be one middle character. b) If the length of the string is even there will be two middle characters. Write Python statements that reads a string, calls the method and prints the result. Part-4 : Please enter a string: 172 The middle character in the string: 7 Please enter a string: test The middle characters in the string: es