diff --git a/modules/bnporc/deprecated/pro.py b/modules/bnporc/deprecated/pro.py
index 1b456740..d76f92c0 100644
--- a/modules/bnporc/deprecated/pro.py
+++ b/modules/bnporc/deprecated/pro.py
@@ -101,7 +101,7 @@ class ProAccountHistory(Page):
         except IndexError:
             return
 
-        if not 'checked' in checkbox.attrib:
+        if 'checked' not in checkbox.attrib:
             self.browser.select_form(name='formtri')
             self.browser['szTriDate'] = ['date']
             self.browser['szTriRub'] = []
diff --git a/modules/bnporc/pp/browser.py b/modules/bnporc/pp/browser.py
index 7a8afc99..d9893baa 100644
--- a/modules/bnporc/pp/browser.py
+++ b/modules/bnporc/pp/browser.py
@@ -51,7 +51,7 @@ class JsonBrowserMixin(object):
     def open(self, *args, **kwargs):
         if isJSON(kwargs.get('data')):
             kwargs['data'] = json.dumps(kwargs['data'][1])
-            if not 'headers' in kwargs:
+            if 'headers' not in kwargs:
                 kwargs['headers'] = {}
             kwargs['headers']['Content-Type'] = 'application/json'
 
diff --git a/modules/boursorama/pages/accounts_list.py b/modules/boursorama/pages/accounts_list.py
index ad9778fc..1f0c6d20 100644
--- a/modules/boursorama/pages/accounts_list.py
+++ b/modules/boursorama/pages/accounts_list.py
@@ -116,5 +116,5 @@ class AccountsList(Page):
                             account.balance = Decimal(0)
                 else:
                     # because of some weird useless <tr>
-                    if account.id is not None and (not account._link_id or not 'moneycenter' in account._link_id):
+                    if account.id is not None and (not account._link_id or 'moneycenter' not in account._link_id):
                         yield account
diff --git a/modules/bred/bred/browser.py b/modules/bred/bred/browser.py
index 5dea79a5..d28fde62 100644
--- a/modules/bred/bred/browser.py
+++ b/modules/bred/bred/browser.py
@@ -89,7 +89,7 @@ class BredBrowser(DomainBrowser):
                     a.currency = poste['montantTitres']['monnaie']['code'].strip()
                     yield a
 
-                if not 'libelle' in poste:
+                if 'libelle' not in poste:
                     continue
 
                 a.label = ' '.join([content['intitule'].strip(), poste['libelle'].strip()])
diff --git a/modules/lcl/pages.py b/modules/lcl/pages.py
index 474089e1..00f51f54 100644
--- a/modules/lcl/pages.py
+++ b/modules/lcl/pages.py
@@ -233,7 +233,7 @@ class AccountHistoryPage(LoggedPage, HTMLPage):
                 return self.parent.get_colnum('date') is not None and \
                        len(self.el.findall('td')) >= 3 and \
                        self.el.get('class') and \
-                       not 'tableTr' in self.el.get('class')
+                       'tableTr' not in self.el.get('class')
 
             def validate(self, obj):
                 if obj.category == 'RELEVE CB':
diff --git a/modules/tinder/module.py b/modules/tinder/module.py
index 8df11e9e..059f8aa9 100644
--- a/modules/tinder/module.py
+++ b/modules/tinder/module.py
@@ -98,7 +98,7 @@ class TinderModule(Module, CapMessages, CapMessagesPost, CapDating):
 
     def iter_threads(self):
         for thread in self.browser.get_threads():
-            if not 'person' in thread:
+            if 'person' not in thread:
                 # The account has been removed, probably because it was a
                 # spammer.
                 continue
diff --git a/weboob/browser/browsers.py b/weboob/browser/browsers.py
index f4254880..0892091e 100644
--- a/weboob/browser/browsers.py
+++ b/weboob/browser/browsers.py
@@ -794,7 +794,7 @@ class APIBrowser(DomainBrowser):
     def open(self, *args, **kwargs):
         if 'data' in kwargs:
             kwargs['data'] = json.dumps(kwargs['data'])
-        if not 'headers' in kwargs:
+        if 'headers' not in kwargs:
             kwargs['headers'] = {}
         kwargs['headers']['Content-Type'] = 'application/json'
 
diff --git a/weboob/browser/elements.py b/weboob/browser/elements.py
index 7d3f0fb9..9b263509 100644
--- a/weboob/browser/elements.py
+++ b/weboob/browser/elements.py
@@ -298,7 +298,7 @@ class TableElement(ListElement):
         for el in self.el.xpath(self.head_xpath):
             title = self.cleaner.clean(el).lower()
             for name, titles in columns.iteritems():
-                if title in titles and not name in self._cols:
+                if title in titles and name not in self._cols:
                     self._cols[name] = colnum
             try:
                 colnum += int(el.attrib.get('colspan', 1))