Why Does This Condition Execute To False When It Should Execute To True?

I have this code in my spider basic.py file: if l.add_xpath('price', '//*[@id='price']/text()', MapCompose(lambda i: i.replace(',', ''), float), re = '[,.0-

Solution 1:

Just in case someone ran into the same situation:

The answer is that add_xpath does not return anything, and in order to check whether there is an element found or not, get_xpath should be used instead (see here).