Polynomial root finder in Python. Quick and dirty, but it works. Have fun! :-)

rootfinder.py

#!/usr/bin/env python
# Polynomial Root Finder
# SYZYGY-DEV333
# Apache 2.0

print "Python Polynomial Root Finder"
print "Use '**' to mean '^'"

while 1 == 1:

	print

	equ = raw_input("0=") # asks for your equation

	f = lambda x: eval(equ,{"__builtins__":None},{"x":x}) # for saftey, won't accept anything other than an equation

	step = 0.001 # smaller steps are more accurate, but slower
	start = -10 # these parameters should be fine at -10 and 10
	stop = 10

	sign = f(start) > 0

	z = start
	while z <= stop:
		value = f(z)

		if value == 0:
			print "Root found at", z
		elif (value > 0) != sign:
			print "Root found near", z
		sign = value > 0
	 
		z += step

Polynomial Root Finder

Simple polynomial root finder made in Python. It's quick and dirty and horribly inefficient, but it works. Just type in the equation when prompted. You have to change it a little though, so -7x^2+8x+10 would become -7 * x ** 2 + 8 * x + 10. That's all, have fun! :-)