pep8: Use "X not in Y" instead of "not X in Y"

flake8 --select E713, semi-manual fixing

modules/banquepopulaire/pages.py

@@ -266,13 +266,13 @@ class AccountsPage(BasePage):
                     currency = Account.get_currency(m.group(1))
 
             for tr in div.getnext().xpath('.//tbody/tr'):
-                if not 'id' in tr.attrib:
+                if 'id' not in tr.attrib:
                     continue
 
                 args = dict(parse_qsl(tr.attrib['id']))
                 tds = tr.findall('td')
 
-                if len(tds) < 4 or not 'identifiant' in args:
+                if len(tds) < 4 or 'identifiant' not in args:
                     self.logger.warning('Unable to parse an account')
                     continue