Cats

import re
import numpy as np
import math
input_file=open("cats.txt",'r')
senten=list()
dictionary=dict()
i=0

def blua(x):
    global i
    if x not in dictionary:
        dictionary[x]=i
        i+=1
    return x
for line in input_file:
    lst=list(filter(None,re.split('[^a-z]',line.lower())))
    senten.append(lst)
    map(blua,lst);
matrix=np.zeros((len(senten),i));
y=0;
for line in senten:
    for word in line:
        matrix[y,dictionary[word]]+=1
    y+=1
first=[-2,0];
second=[-2,0];
for number in range(1,y-1):
    cos_angle = np.dot(matrix[0], matrix[number]) / np.linalg.norm(matrix[0]) / np.linalg.norm(matrix[number])
    print(cos_angle)
    if cos_angle>first[0]:
        second[0]=first[0]
        second[1]=first[1]
        first[0]=cos_angle
        first[1]=number
    elif cos_angle>second[0]:
        second[0]=cos_angle
        second[1]=number
print(first[1])
print(second[1])
input_file.close