restore pairwise for older python 3 versions

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = cleanvid
-version = 1.5.2
+version = 1.5.3
 author = Seth Grover
 author_email = [email protected]
 description = cleanvid is a little script to mute profanity in video files.

src/cleanvid/__init__.py

@@ -1,6 +1,6 @@
 """cleanvid is a little script to mute profanity in video files."""
 
-__version__ = "1.5.2"
+__version__ = "1.5.3"
 __author__ = "Seth Grover <[email protected]>"
 __all__ = []
 

src/cleanvid/cleanvid.py

@@ -5,7 +5,6 @@
 import chardet
 import codecs
 import errno
-import itertools
 import json
 import os
 import shutil
@@ -34,6 +33,13 @@
 PLEX_AUTO_SKIP_DEFAULT_CONFIG = '{"markers":{},"offsets":{},"tags":{},"allowed":{"users":[],"clients":[],"keys":[]},"blocked":{"users":[],"clients":[],"keys":[]},"clients":{},"mode":{}}'
 
 
+# thanks https://docs.python.org/3/library/itertools.html#recipes
+def pairwise(iterable):
+    a, b = tee(iterable)
+    next(b, None)
+    return zip(a, b)
+
+
 ######## GetFormatAndStreamInfo ###############################################
 def GetFormatAndStreamInfo(vidFileSpec):
     result = None
@@ -335,7 +341,7 @@ def CreateCleanSubAndMuteList(self):
         # OR if the previous text contained profanity and lies within the pad ...
         # then include the subtitle in the new set
         prevNaughtySub = None
-        for sub, subPeek in itertools.pairwise(subs):
+        for sub, subPeek in pairwise(subs):
             newText = replacer.sub(lambda x: self.swearsMap[x.group()], sub.text)
             newTextPeek = (
                 replacer.sub(lambda x: self.swearsMap[x.group()], subPeek.text) if (subPeek is not None) else None
@@ -422,7 +428,7 @@ def CreateCleanSubAndMuteList(self):
             plexDict["markers"][self.plexAutoSkipId] = []
             plexDict["mode"][self.plexAutoSkipId] = "volume"
 
-        for timePair, timePairPeek in itertools.pairwise(newTimestampPairs):
+        for timePair, timePairPeek in pairwise(newTimestampPairs):
             lineStart = (
                 (timePair[0].hour * 60.0 * 60.0)
                 + (timePair[0].minute * 60.0)