Python - Delta

gistfile1.txt

import os
from time import sleep
print("Delta calculation:")


def calc_delta():
    a = float(input("Gimme 'a' "))
    b = float(input("Gimme 'b' "))
    c = float(input("Gimme 'c' "))
    delta = b * b - 4.0 * a * c
    print("Delta: " + str(delta))
    element_delta = delta ** 0.5
    print("Element of delta: " + str(element_delta))
    if delta > 0:
        xi = ((-b - element_delta) / 2 * a)
        xii = ((-b + element_delta) / 2 * a)
        print("Solution I = " + str(xi) + "\nSolution II = " + str(xii))
    elif delta == 0:
        xo = -b / (2 * a)
        print("Because Delta = 0, u have only one solution = " + str(xo))
    else:
        print("You don't have real solutions.")


while True:
    calc_delta()
    while True:
        answer = str(input('Run again? (y/n): '))
        if answer in ('y', 'n'):
            break
        print("Invalid input!")
    if answer == 'y':
        os.system("cls")
        continue
    else:
        print("Goodbye!")
        sleep(2)
        break