Generating part of speech tags POS for English text, using NLTK library

#nltk.download('punkt')
#import nltk
#nltk.download('averaged_perceptron_tagger')
  
import pandas as pd
import nltk
from nltk.tokenize import word_tokenize

def generate_pos(tx):
    text = word_tokenize(tx)
    tag_txt = nltk.pos_tag(text)
    hh = len(tx.split(" "))
    sumtags = ""
    keep_res = []
    for i in range(0,hh):
        sumtags += tag_txt[i][1] + " " 
    keep_res.append("{}\t{}".format(tx, sumtags))
    sumtags = ""
    return keep_res

xlist = ['I love you', 'one thousand seven hundred forty',
         'april thirtieth to day before yesterday',
         'aug of next year','day before yesterday to november twenty second',
         'february of last year']

   
for s in xlist:
    print(generate_pos(tx= s)[0])