test

f = lambda x:x**2-8
def dich(f,a,b,e):
    deb = a
    fin = b
    mil = (a+b)/2
    while f(deb)*f(fin)<0 and (fin-deb)>e:
        if f(mil)==0:
            break
        elif f(deb)*f(mil)<0:
            fin = mil
        else:
            deb = mil
        mil = (deb+fin)/2
    return([deb,fin])
print(dich(f,0,4,pow(10,-4)))