Quadratic equation solver

Create a text file quadeq.py. In it, define function get_roots(a, b, c) which

• accepts the coefficients $a$, $b$, and $c$ of a quadratic equation $ax^2 + bx + c = 0$, and
• returns a list of its real roots, i.e., the function returns
  • a list with 2 numbers when the equation has 2 real roots,
  • a list with a single number when the equation has a single root only, or
  • an empty list when the equation has no real roots.

Assume that a is always nonzero.

• 3 points for automatic checks
• 1 point for manual evaluation (is the code readable)