solve_quadratic_equation

#! usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import math
import cmath

def solve(_coefficients):
    x = [None, None, None]
    if (_coefficients[0] == 0) and (_coefficients[1] == 0):
        if _coefficients[2] == 0:
            x[2] = 3
            return x
    d = _coefficients[1] ** 2 - 4 * _coefficients[0] * _coefficients[2]
    if d > 0:
        d = math.sqrt(d)
        x[0] = -(_coefficients[1] - d) / (2 * _coefficients[0])
        x[1] = -(_coefficients[1] + d) / (2 * _coefficients[0])
        x[2] = 2
    elif d == 0:
        x[0] = -(_coefficients[1]) / (2 * _coefficients[0])
        x[2] = 1
    else:
        d = cmath.sqrt(d)
        x[0] = -(_coefficients[1] - d) / (2 * _coefficients[0])
        x[1] = -(_coefficients[1] + d) / (2 * _coefficients[0])
        x[2] = 2
    return x

if len(sys.argv) > 4:
    print "Слишком много аргументов"
elif len(sys.argv) < 4:
    print "Слишком мало аргументов"
else:
    coeffs=sys.argv[1:]
    try:
        coeffs[0] = float(sys.argv[1])
        coeffs[1] = float(sys.argv[2])
        coeffs[2] = float(sys.argv[3])
    except ValueError:
        print "Один или несколько из введенных аргументов не являются числами"
    else:
        print "Квадратное уравнение : {0}*x^2+{1}*x+{2}=0".format(coeffs[0], coeffs[1], coeffs[2])
        solution = solve(coeffs)
        if solution[2] == 2:
            print "Решение 1: {0}".format(solution[0])
            print "Решение 2: {0}".format(solution[1])
        elif solution[2] == 1:
            print "Решение : {0}".format(solution[0])
        elif solution[2] == 3:
            print "Решение уравнения может быть любое число"
        else:
            print ("Решений нет")