fast mul and pow

from math import *
import random
def fast_mul(x, y):
    v = x * y
    b = False
    if x < 0 and x < 0:
        b = True
    z = 0
    q = 0
    if x % 2 != 0:
        q += 1
        z += y
    #print(x, y, z)
    while x != 0 and x != -1:
        if x > 0:
            x = floor(x / 2)
        else:
            x = ceil(x / 2)
        y = y * 2
        if x % 2 != 0:
            q += 1
            z += y
        #print(x, y, z)
    if b:
        z *= -1
    #print(x, y, z)

    try:
        assert z == v
    except AssertionError:
        print(False)
        print(z, v)
    else:
        return z

#print(fast_mul(0,5))

def fast_pow(y, x):
    v = pow(y, x)
    b = False
    c = False
    if x != y:
        c == True
    if y % 2 == 0 and x < 0:
        b = True
    z = 1
    q = 0
    if x % 2 != 0:
        q += 1
        z *= y
    #print(x, y, z)
    while x != 0 and x != -1:
        if x > 0:
            x = floor(x / 2)
        else:
            x = ceil(x / 2)
        y = fast_mul(y, y)
        if x % 2 != 0:
            q += 1
            z *= y
        print(x, y, z)
    if b:
        z *= -1
    #if c:
       # z = z - 1
    #print(x, y, z)
    try:
        assert z == v
    except AssertionError:
        print(False)
    else:
        return print(z)

#fast_pow(7, 0)

def fast_mul_gen(y):
    x = random.randint(2, 50)
    v = x * y
    b = False
    print("" + str(x) + " умножаем на " + str(y))
    if x < 0 and x < 0:
        b = True
    z = 0
    q = 0
    buf = 0
    if x % 2 != 0:
        q += 1
        z += y
        print("Z = " + str(buf) + " + " + str(y))
        buf = y
    while x != 0 and x != -1:
        if x > 0:
            x = floor(x / 2)
        else:
            x = ceil(x / 2)
        y = y + y
        if x % 2 != 0:
            q += 1
            z += y
            print("Z = " + str(buf) + " + " + str(y))
            buf = z
    if b:
        z *= -1

    try:
        assert z == v
    except AssertionError:
        print(False)
        print(z, v)
    else:
        return print("Z = " + str(z))

fast_mul_gen(4)