Playing with perceptron using Python

Perceptron code from ゼロから作るDeep Learning
(def ANDの所)

words.txt

Hello my name is Tsubasa Kato. I like supercomputer.

perceptron-test.py

f = open ('words.txt')
x1 = 0
x2 = 0

def AND(x1, x2):
	w1, w2, theta = 0.5, 0.5, 0.7
	tmp = x1*w1 + x2*w2
	if tmp <= theta: 
		return 0
	elif tmp > theta:
		return 1

for word in f.read().split():
	hitflag = 0

	word = word.replace(',','')
	word = word.replace('.','')

	print(word)
	if word == "supercomputer":
		hitflag = 1
		x1 = x1 + 1
		x2 = x2 + 1
	if word == "Hello":
		hitflag = 1
		x1 = x1 -2
		x2 = x2 -2	
	
	if hitflag == 1:
		print "HIT!"
	

print AND(x1,x2)