diff --git a/refscrub/refscrub.py b/refscrub/refscrub.py
index 9a1da488f3b5285957d2250bda78390e02a0786a..a05d4ea1d6271f76414943ba124c0f3d8cea9dc5 100644
--- a/refscrub/refscrub.py
+++ b/refscrub/refscrub.py
@@ -13,13 +13,22 @@ August 2018
 Updates to work on both Python 2 & 3.
 Code cleanup to match PEP 8.
 Cleanup global vars.
+
+Maeva Pourpoint
+August 2020
+Updates to work under Python 3.
+Unit tests to ensure basic functionality.
+Code cleanup to conform to the PEP8 style guide.
+Directory cleanup (remove unused files introduced by Cookiecutter).
+Packaged with conda.
 """
-import sys
+
 import argparse
 import struct
+import sys
 from os.path import basename, getsize, isfile
 
-PROG_VERSION = '2018.228'
+PROG_VERSION = '2020.216'
 VERBOSE = False
 EXTRACT = False
 SUMMARY_FILE = 'scrubsum.txt'
@@ -74,9 +83,11 @@ class SNseen(dict):
 
 class RTPacket:
     RTstruct = struct.Struct('2c1B1B2B6B2B2B')
-    # Define the packet types as byte literals, since that is what the above structure will cause the type field
-    # do be decoded as. Without this, they will not match below.
-    packet_types = (b'AD', b'CD', b'DS', b'DT', b'EH', b'ET', b'OM', b'SH', b'SC')
+    # Define the packet types as byte literals, since that is what the above
+    # structure will cause the type field do be decoded as. Without this, they
+    # will not match below.
+    packet_types = (b'AD', b'CD', b'DS', b'DT',
+                    b'EH', b'ET', b'OM', b'SH', b'SC')
     seen = SNseen()
     goodpkts = 0
     IOErrorCount = 0
@@ -111,11 +122,13 @@ class RTPacket:
             print(e)
 
     def settimestring(self):
-        self.timestring = "%(year)0.2d:%(day)0.3d:%(hour)0.2d:%(min)0.2d:%(sec)0.2d.%(millisec)0.3d" % self.__dict__
+        self.timestring = ("%(year)0.2d:%(day)0.3d:%(hour)0.2d:%(min)0.2d:"
+                           "%(sec)0.2d.%(millisec)0.3d" % self.__dict__)
 
     def isvalid(self):
         """
-        Returns True if a valid reftek packet (headers parse well and are valid)
+        Returns True if a valid reftek packet (headers parse well and are
+        valid)
         Also populates the objects attributes SN, time, etc.
         """
 
@@ -128,11 +141,12 @@ class RTPacket:
             self.expnum = int("%0.2X" % tup[2])
             self.year = int("%0.2X" % tup[3])
             self.sn = "%0.2X%0.2X" % (tup[4], tup[5])
-            assert '9001' <= self.sn, "BAD SN"
+            assert self.sn >= '9001', "BAD SN"
             assert self.sn <= 'FFFF', "BAD SN"
             time = "%0.2X%0.2X%0.2X%0.2X%0.2X%0.2X" % tup[6:12]
             self.day, self.hour, self.min, self.sec, self.millisec = \
-                int(time[:3]), int(time[3:5]), int(time[5:7]), int(time[7:9]), int(time[9:])
+                int(time[:3]), int(time[3:5]), int(
+                    time[5:7]), int(time[7:9]), int(time[9:])
             assert self.day <= 366, "BAD TIME"
             assert self.hour <= 24, "BAD TIME"
             assert self.min <= 60, "BAD TIME"
@@ -199,8 +213,9 @@ def readfile(infile):
             infile.seek(-1023, 1)
 
     print(summary(infile))
-    # commented out as when run with many files as input like a cf dir the closed fh's need to be written to and isn't
-    # smart enough to be opened RTPacket.seen.close_fhs()
+    # commented out as when run with many files as input like a cf dir the
+    # closed fh's need to be written to and isn't smart enough to be opened
+    # RTPacket.seen.close_fhs()
 
 
 def summary(infile):
@@ -208,7 +223,8 @@ def summary(infile):
     offstring = "%6s: %12d\n"
     s = offstring % ("OFFSET", infile.tell())
     s += offstring % ("OF", FILESIZE)
-    s += "Good packets: %d = %8.2fMB\n" % (RTPacket.goodpkts, RTPacket.goodpkts / 1024.0)
+    s += "Good packets: %d = %8.2fMB\n" % (
+        RTPacket.goodpkts, RTPacket.goodpkts / 1024.0)
     s += "IOErrors: %d\n" % RTPacket.IOErrorCount
     s += str(RTPacket.seen) + '\n'
     return s
@@ -259,13 +275,13 @@ def main():
             PREFIX = basename(infilename)
         print("Using prefix %s" % PREFIX)
         FILESIZE = getsize(infilename)
-        # Must open the file in binary mode or else we will have unicode issues when reading.
+        # Must open the file in binary mode or else we will have unicode issues
+        # when reading.
         with open(infilename, "rb") as infile:
             readfile(infile)
             if args.SUMMARY:
                 summaryfh.write(infilename + ', ' + PREFIX + '\n')
                 summaryfh.write(summary(infile))
-
         print("----------------------------------------")
     if isfile(SUMMARY_FILE):
         summaryfh.close()
diff --git a/setup.py b/setup.py
index 1dbc630f0fd2fbd36748db864703f0472bac75f1..7487aa2f8421d02ffdbaeddfd3e3dcf76f58c054 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ setup(
         ],
     },
     install_requires=[],
-    setup_requires = [],
+    setup_requires=[],
     extras_require={
         'dev': [
             'pip',