Using python: (see attached- I need help with part Q2) Add a method to the person class name it (username) that takes the email and take off all the part from @ and after, and assigns the string before the @ sign to a variable username. For example: malabdullah@UT.edu, the method will assign 'malabdullah' as the username.

Rules:  Corner cases.  By convention, the row and column indices are integers between 0 and n − 1, where (0, 0) is the upper-left site. Throw an IllegalArgumentException if any argument to open(), isOpen(), or isFull() is outside its prescribed range. Throw an IllegalArgumentException in the constructor if n ≤ 0. Unit testing.  Your main() method must call each public constructor and method directly and help verify that they work as prescribed (e.g., by printing results to standard output). Performance requirements.  The constructor must take Θ(n^2) time; all instance methods must take Θ(1)Θ(1) time plus Θ(1)Θ(1) calls to union() and find().

Description is " A MathVector object will be passed to your method.  Return its contents as a String.   If you look in the file MathVector.java you'll see there is a way to output the contents of a MathVector object as a String.  This makes it useful for displaying to the user.     You might have noticed that there's an @override term there.  That's because many objects already have a "toString()" method associated with them... because Java was designed to include them by default.  Here, the override tells Java "I know, I know.  You already have a toString() that you'd assign here.  But it's not good enough.  Here's a better one for this particular kind of object."  It's a little bit like saying "Most humans have two legs.  So, by default, I'll give everyone two legs.  But sometimes we override that and give no legs, or just one leg to a person.  And sometimes we give them four so that they can be a centaur!"   To use this in a println() method, just name your object.  The toString()…

Examine the method header below, then write a call to the method as an example.a personal void ValueReset (ref int value)