Bisection method

# Bisection method

def f(x):
return (x**2-2)
e=0.00001
a=float(input('Enter limit a   '))
b=float(input('Enter limit b   '))
if f(a)*f(b)<=0.0:
while abs(a-b)>=e:

x=(a+b)/2  
if(f(x)*f(a)>0):
a=x
else:
b=x
print'The best approximation is %.5f'%x
else:
print' sorry !!! There is no root  between',a,'and ',b