import lxml.html as LH
content = '''<ul id="ABC"><li>172</li><li>68</li></ul>'''
root = LH.fromstring(content)
tree = root.getroottree()
for li in tree.xpath('//ul[@id="ABC"]//li'):
print(li.text_content())
aW1wb3J0IGx4bWwuaHRtbCBhcyBMSApjb250ZW50ID0gJycnPHVsIGlkPSJBQkMiPjxsaT4xNzI8L2xpPjxsaT42ODwvbGk+PC91bD4nJycKcm9vdCA9IExILmZyb21zdHJpbmcoY29udGVudCkKdHJlZSA9IHJvb3QuZ2V0cm9vdHRyZWUoKQpmb3IgbGkgaW4gdHJlZS54cGF0aCgnLy91bFtAaWQ9IkFCQyJdLy9saScpOiAKICAgIHByaW50KGxpLnRleHRfY29udGVudCgpKSA=