import random;
 
if __name__ == "__main__":
    
    x=random.random()
    s=[]
    n=[]
    e=[]
    w=[]
    for i range(100):
        if x < 0.25:
            s.append(x)
        if x < 0.50:
            s.append(x)
        if x < 0.75:
            s.append(x)        
        if x < 0.99:
            s.append(x)
    
    plt.plot(x1,z)
    plt.show()