Bisection't

import math
from math import e
from prettytable import PrettyTable

n = float(input("input: "))
error = 0.00001
#print('Error: {:f}'.format(error))

t = PrettyTable(['n', 'A', 'B', 'sign f(A)', 'sign f(B)', 'C', 'f(C)', '|A-B|< Error', 'Yes/No'])

for n in range(99):
    a = input('Value of A: ')
    b = input('Value of B: ')
    c = (float(a)+float(b))/2
    fa = pow(math.e,float(a))-pow(float(a),2)+(3*float(a))-2
    fb = pow(math.e,float(b))-pow(float(b),2)+(3*float(b))-2
    fc = pow(math.e,float(c))-pow(float(c),2)+(3*float(c))-2
    AB = abs(float(a)-float(b))

    #print(f'f(a): {fa}')
    #print(f'f(b): {fb}')
    #print(f'C: {c}')
    #print('f(c): {:f}'.format(truncate(float(fc))))
    #print(f'f(c): {truncate(float(fc))}')
    #print(f'|A-B|<Error: {AB}')

    f = ''
    if AB < error:
        f = 'YES'
        break
    else:
        f = 'NO'

    t.add_row([n, a, b, fa, fb, c, fc, AB, f])
    b = fb
    if f=='YES':
        break

    print(t)

def truncate(n):
    return int(n * 1000000000) / 1000000000