part $3$ Part $3$

$1.$ Create a NEW file named Cubic.py and implement the following class Cubic to find the roots of cubic equations. Create your prog$2$Q$3.$ ipynb or prog$2$Q$3.$ py modified from prog$2$Q$1$ to import the new class. Submit both Cubic.py and prog$2$Q$3$ upon zipping them together as prog$2$Q$3.$ zip.

$```$

class Cubic:

# constructor to initialize a list of $4$ coefficients: coeff$[]$

# there should be only one attribute coeff$[],$ instead of $4$ attributes

def $\_\_$init$\_\_($self$,$ C $=[1,1,1,1])$:

$...$

# Store the values of input parameter to coeff$[]$

def setCoeff$($self$,$ C$)$ :

$```$