Python Chord Method

Implementation of Chord Method written in Python.

IN
-3
0
0.00001
OUT
: -1.0 f(x): -2.0
X: -2.0 f(x): -1.0
X: -2.3333333333333335 f(x): -0.22222222222222188
X: -2.4 f(x): -0.04000000000000026
X: -2.4117647058823533 f(x): -0.006920415224912602
X: -2.413793103448276 f(x): -0.0011890606420928984
X: -2.4141414141414144 f(x): -2.0406081012080968E-4
X: -2.414201183431953 f(x): -3.501277966366789E-5

# ? 2018 TheFlyingKeyboard and released under MIT License
# theflyingkeyboard.net

def function(x):
    return x * (x + 2) - 1

intervalBegin = float(input("Enter begining of interval: "))
intervalEnd = float(input("Enter end of interval: "))
precision = float(input("Enter precision of method: "))

x = (intervalBegin * function(intervalEnd) - intervalEnd * function(intervalBegin)) / (function(intervalEnd) - function(intervalBegin))

if(function(intervalBegin) * function(intervalEnd) < 0):
  while(abs(function(x)) > precision):
    print("X: ", x, " f(x): ", function(x))

    if(function(intervalBegin) * function(x) < 0):
         x = (x * function(intervalBegin) - intervalBegin * function(x)) / (function(intervalBegin) - function(x))
    else:
        x = (x * function(intervalEnd) - intervalEnd * function(x)) / (function(intervalEnd) - function(x))