Use flake8 if available instead of pyflakes

With flake8, we can check for more issues and ignore those who are not
real issues.

This allowed me to find genuine errors in:
- modules/boursorama/pages/account_history.py
- modules/ing/pages/login.py
- weboob/tools/application/qt/qt.py
I left one in weboob/tools/browser/browser.py for the time being.

Some PEP8 fixes on other files.

weboob/tools/application/formatters/iformatter.py

@@ -30,7 +30,7 @@ try:
     import tty, termios
 except ImportError:
     PROMPT = '--Press return to continue--'
-    def readch():
+    def readch():  # NOQA
         return sys.stdin.readline()
 else:
     PROMPT = '--Press a key to continue--'
@@ -163,7 +163,6 @@ class IFormatter(object):
             self.output(formatted)
         return formatted
 
-
     def format_obj(self, obj, alias=None):
         """
         Format an object to be human-readable.

weboob/tools/application/qt/qt.py

@@ -26,8 +26,7 @@ from PyQt4.QtCore import QTimer, SIGNAL, QObject, QString, QSize, QVariant, QMut
 from PyQt4.QtGui import QMainWindow, QApplication, QStyledItemDelegate, \
                         QStyleOptionViewItemV4, QTextDocument, QStyle, \
                         QAbstractTextDocumentLayout, QPalette, QMessageBox, \
-                        QSpinBox, QLineEdit, QComboBox, QCheckBox, QInputDialog, \
-                        QLineEdit
+                        QSpinBox, QLineEdit, QComboBox, QCheckBox, QInputDialog
 
 from weboob.core.ouiboube import Weboob
 from weboob.core.scheduler import IScheduler

weboob/tools/browser/firefox_cookies.py

@@ -21,7 +21,7 @@
 try:
     import sqlite3 as sqlite
 except ImportError, e:
-    from pysqlite2 import dbapi2 as sqlite
+    from pysqlite2 import dbapi2 as sqlite  # NOQA
 
 from mechanize import CookieJar, Cookie
 
@@ -47,7 +47,8 @@ class FirefoxCookieJar(CookieJar):
 
     def load(self):
         db = self.__connect()
-        if not db: return
+        if not db:
+            return
 
         cookies = db.execute("""SELECT host, path, name, value, expiry, lastAccessed, isSecure
                                 FROM moz_cookies
@@ -83,12 +84,15 @@ class FirefoxCookieJar(CookieJar):
 
     def save(self):
         db = self.__connect()
-        if not db: return
+        if not db:
+            return
 
         db.execute("DELETE FROM moz_cookies WHERE host LIKE '%%%s%%'" % self.domain)
         for cookie in self:
-            if cookie.secure: secure = 1
-            else: secure = 0
+            if cookie.secure:
+                secure = 1
+            else:
+                secure = 0
             if cookie.expires is not None:
                 expires = cookie.expires
             else:

weboob/tools/config/yamlconfig.py

@@ -29,8 +29,8 @@ try:
     from yaml import CLoader as Loader
     from yaml import CDumper as Dumper
 except ImportError:
-    from yaml import Loader
-    from yaml import Dumper
+    from yaml import Loader  # NOQA
+    from yaml import Dumper  # NOQA
 
 from .iconfig import IConfig, ConfigError
 

weboob/tools/json.py

@@ -27,4 +27,4 @@ try:
     import simplejson as json
 except ImportError:
     # Python 2.6+ has a module similar to simplejson
-    import json
+    import json  # NOQA

weboob/tools/ordereddict.py

@@ -22,16 +22,15 @@ try:
     from collections import OrderedDict
 except ImportError:
     try:
-        from simplejson import OrderedDict
+        from simplejson import OrderedDict  # NOQA
     except ImportError:
         try:
-            from ordereddict import OrderedDict
+            from ordereddict import OrderedDict  # NOQA
         except ImportError:
             ## {{{ http://code.activestate.com/recipes/576693/ (r6)
             from UserDict import DictMixin
 
-            class OrderedDict(dict, DictMixin):
-
+            class OrderedDict(dict, DictMixin):  # NOQA
                 def __init__(self, *args, **kwds):
                     if len(args) > 1:
                         raise TypeError('expected at most 1 arguments, got %d' % len(args))
@@ -123,7 +122,7 @@ except ImportError:
 
                 def __eq__(self, other):
                     if isinstance(other, OrderedDict):
-                        return len(self)==len(other) and self.items() == other.items()
+                        return len(self) == len(other) and self.items() == other.items()
                     return dict.__eq__(self, other)
 
                 def __ne__(self, other):

weboob/tools/parsers/elementtidyparser.py

@@ -30,7 +30,7 @@ from elementtidy import TidyHTMLTreeBuilder
 try:
     from xml.etree import cElementTree as ElementTree
 except ImportError:
-    from xml.etree import ElementTree
+    from xml.etree import ElementTree  # NOQA
 
 from .iparser import IParser
 

weboob/tools/parsers/html5libparser.py

@@ -22,7 +22,7 @@ from html5lib import treebuilders, HTMLParser
 try:
     from xml.etree import cElementTree as ElementTree
 except ImportError:
-    from xml.etree import ElementTree
+    from xml.etree import ElementTree  # NOQA
 
 from .iparser import IParser
 

weboob/tools/parsers/htmlparser.py

@@ -23,7 +23,7 @@ import htmlentitydefs
 try:
     from xml.etree import cElementTree as ElementTree
 except ImportError:
-    from xml.etree import ElementTree
+    from xml.etree import ElementTree  # NOQA
 
 from .iparser import IParser
 
@@ -68,6 +68,7 @@ class HTMLTreeBuilder(_HTMLParser):
         except:
             pass
 
+
 class HTMLParser(IParser):
     def parse(self, data, encoding=None):
         parser = HTMLTreeBuilder(encoding)