Get a part of the text

You can use rfind( ) , which returns the index of the last found encounter, or -1 if there is none. In combination with the slicing of strings in python:

text = '/departamento-venta-palermo-pagina-3.html'
print( text[text.rfind( '-' ) + 1: ] )

Detail:

• text.rfind( '-' ) : returns the last occurrence of - in the string.
• + 1 : no we want the position of the last - , but the next position .
• text[ inicio : final ] : cut the string; returns a new string, from position inicio to position final .

Advantages:

• It's fast : few operations.
• It's flexible : you only need a - in the string, and it's easy to adapt.

Disadvantages:

• It's flexible : it does not check absolutely nothing , except for the presence of that - .

If the urls follow the same pattern where after the third script appears the page you could use this:

url = '/departamento-venta-palermo-pagina-13.html'
''.join(url.split('-')[3:]) // 'pagina13.html'

You can do it with a regular expression:

import re
url="/departamento-venta-palermo-pagina-3333.html"

num = re.findall('[1-9]\d*|0\d+',url)[0]
print(num)

#solo obtener de pagina en adelante
print(''.join(url.split('-')[-2:]))

reference:
python re