# -*- coding: utf-8 -*-
def bisection(a,b):
    fa=f(a)
    fb=f(b)
    
    if fa*fb>0:
        print('f(a) and f(b) must have different sign')
        return None #If there is no root, terminate the process if it does not fulfil the condition.
    
    for i in range(50): 
        
        c=(a+b)/2
        fc=f(c)
        
        if fc== 0:
            break
        
        if fa*fc>0:
            a, fa =c,fc
            
        if fb*fc>0:
            b, fb =c,fc
            
    return c        

def f(x): return x**3-10*x**2+5

a=0
b=1

x=bisection(a,b)
print(x)