This page https://www.kijiji.ca/v-1-bedroom-apartments-condos/ville-de-montreal/1-chambre-chauff-eau-chaude-incl-vsl-514-856-0038/1334431659 contains this span class:
<According to the docs you have several options:
Use a regex:
soup.find_all('span', attrs={'class': re.compile('^currentPrice.*')})
Use a function:
soup.find_all('span',
attrs={'class': lambda e: e.startswith('currentPrice') if e else False})
You could try a CSS selector soup.select('span[class*="currentPrice-"]')