import matplotlib.pyplot as plt
from random import random
def mandelbrot(n):
    for i in range(n):
        c=complex(4*random()-2,4*random()-2)
        z=0
        k=0
        while abs(z)<2 and k<50:
            z=z**2+c
            k=k+1
        if k==50:
            plt.plot(c.real,c.imag,"rx",ms=0.5)
    plt.xlim=(-2,2)
    plt.ylim=(-2,2)
    ax=plt.gca()
    ax.spines["bottom"].set_position(("data",0))
    ax.spines["left"].set_position(("data",0))
    plt.show()