From 1a529b6b0e4dc791ee2dbca40c7a671ff30bdd4d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rodolfo=20Garc=C3=ADa=20Pe=C3=B1as=20=28kix=29?=
 <kix@kix.es>
Date: Sun, 30 Aug 2020 11:27:03 +0200
Subject: [PATCH] offlineimap/ files singleton-comparison

This patch change these errors in the offlineimap folder

C0121: Comparison to None should be 'expr is None' (singleton-comparison)
C0121: Comparison to None should be 'expr is not None' (singleton-comparison)
---
 offlineimap/CustomConfig.py |  2 +-
 offlineimap/accounts.py     | 12 ++++++------
 offlineimap/imapserver.py   | 12 ++++++------
 offlineimap/imaputil.py     |  2 +-
 offlineimap/init.py         |  2 +-
 5 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/offlineimap/CustomConfig.py b/offlineimap/CustomConfig.py
index 689270b..47a5a41 100644
--- a/offlineimap/CustomConfig.py
+++ b/offlineimap/CustomConfig.py
@@ -140,7 +140,7 @@ class CustomConfigParser(SafeConfigParser):
 
         Returns transformed string."""
 
-        if string == None:
+        if string is None:
             return None
         for f in transforms:
             string = f(string)
diff --git a/offlineimap/accounts.py b/offlineimap/accounts.py
index 84c8579..77d8f0e 100644
--- a/offlineimap/accounts.py
+++ b/offlineimap/accounts.py
@@ -561,7 +561,7 @@ def syncfolder(account, remotefolder, quick):
 
         new.cachemessagelist()
         min_uid = partial.retrieve_min_uid()
-        if min_uid == None:  # min_uid file didn't exist
+        if min_uid is None:  # min_uid file didn't exist
             if len(new.getmessageuidlist()) > 0:
                 raise OfflineImapError("To use startdate on Repository %s, "
                                        "Repository %s must be empty" %
@@ -612,27 +612,27 @@ def syncfolder(account, remotefolder, quick):
         maxage = localfolder.getmaxage()
         localstart = localfolder.getstartdate()
         remotestart = remotefolder.getstartdate()
-        if (maxage != None) + (localstart != None) + (remotestart != None) > 1:
+        if (maxage is not None) + (localstart is not None) + (remotestart is not None) > 1:
             six.reraise(OfflineImapError,
                         OfflineImapError("You can set at most one of the "
                                          "following: maxage, startdate (for the local "
                                          "folder), startdate (for the remote folder)",
                                          OfflineImapError.ERROR.REPO),
                         exc_info()[2])
-        if (maxage != None or localstart or remotestart) and quick:
+        if (maxage is not None or localstart or remotestart) and quick:
             # IMAP quickchanged isn't compatible with options that
             # involve restricting the messagelist, since the "quick"
             # check can only retrieve a full list of UIDs in the folder.
             ui.warn("Quick syncs (-q) not supported in conjunction "
                     "with maxage or startdate; ignoring -q.")
-        if maxage != None:
+        if maxage is not None:
             cachemessagelists_upto_date(maxage)
             check_uid_validity()
-        elif localstart != None:
+        elif localstart is not None:
             cachemessagelists_startdate(remotefolder, localfolder,
                                         localstart)
             check_uid_validity()
-        elif remotestart != None:
+        elif remotestart is not None:
             cachemessagelists_startdate(localfolder, remotefolder,
                                         remotestart)
             check_uid_validity()
diff --git a/offlineimap/imapserver.py b/offlineimap/imapserver.py
index 973deb2..bbc9567 100644
--- a/offlineimap/imapserver.py
+++ b/offlineimap/imapserver.py
@@ -171,10 +171,10 @@ class IMAPServer():
     def __getpassword(self):
         """Returns the server password or None"""
 
-        if self.goodpassword != None:  # use cached good one first
+        if self.goodpassword is not None:  # use cached good one first
             return self.goodpassword
 
-        if self.password != None and self.passworderror == None:
+        if self.password is not None and self.passworderror is None:
             return self.password  # non-failed preconfigured one
 
         # get 1) configured password first 2) fall back to asking via UI
@@ -211,7 +211,7 @@ class IMAPServer():
         passwd = self.__getpassword()
         authz = ''
         NULL = '\x00'
-        if self.user_identity != None:
+        if self.user_identity is not None:
             authz = self.user_identity
 
         retval = NULL.join((authz, authc, passwd))
@@ -598,13 +598,13 @@ class IMAPServer():
             if dat != [None]:
                 imapobj.capabilities = tuple(dat[-1].upper().split())
 
-            if self.delim == None:
+            if self.delim is None:
                 listres = imapobj.list(self.reference, '')[1]
-                if listres == [None] or listres == None:
+                if listres == [None] or listres is None:
                     # Some buggy IMAP servers do not respond well to LIST "" ""
                     # Work around them.
                     listres = imapobj.list(self.reference, '"*"')[1]
-                if listres == [None] or listres == None:
+                if listres == [None] or listres is None:
                     # No Folders were returned. This occurs, e.g. if the
                     # 'reference' prefix does not exist on the mail
                     # server. Raise exception.
diff --git a/offlineimap/imaputil.py b/offlineimap/imaputil.py
index c9ff7d0..c510b3d 100644
--- a/offlineimap/imaputil.py
+++ b/offlineimap/imaputil.py
@@ -208,7 +208,7 @@ def uid_sequence(uidlist):
 
     for item in iter(sorted_uids):
         item = int(item)
-        if start == None:  # First item
+        if start is None:  # First item
             start, end = item, item
         elif item == end + 1:  # Next item in a range
             end = item
diff --git a/offlineimap/init.py b/offlineimap/init.py
index be3e448..0ed3316 100644
--- a/offlineimap/init.py
+++ b/offlineimap/init.py
@@ -245,7 +245,7 @@ class OfflineImap():
 
         # Which ui to use? CLI option overrides config file.
         ui_type = config.getdefault('general', 'ui', 'ttyui')
-        if options.interface != None:
+        if options.interface is not None:
             ui_type = options.interface
         if '.' in ui_type:
             # Transform Curses.Blinkenlights -> Blinkenlights.