from lxml import etree
import requests

resp = requests.get('http://www.1sg.sk/index.php?id=1110&node=0&datum=2019-05-24')

# resp.content je typu string
html = etree.HTML(resp.content)

# tabulky je zoznam vsetkych tabuliek
tabulky = html.xpath('//table')

for t in tabulky:
    t.getparent().remove(t)

print(etree.tostring(html))