diff --git a/pdfminer/ccitt.py b/pdfminer/ccitt.py
index 0a9a78ca..57d4b2da 100644
--- a/pdfminer/ccitt.py
+++ b/pdfminer/ccitt.py
@@ -11,7 +11,6 @@
 #    FOR GROUP 4 FACSIMILE APPARATUS"
 
 
-import sys
 import array
 from typing import (Any, Callable, Dict, Iterator, List, MutableSequence,
                     Optional, Sequence, Union, cast)
@@ -551,13 +550,13 @@ def close(self) -> bytes:
         return self._buf
 
     def output_line(self, y: int, bits: Sequence[int]) -> None:
-        bytes = array.array('B', [0]*((len(bits)+7)//8))
+        arr = array.array('B', [0]*((len(bits)+7)//8))
         if self.reversed:
             bits = [1-b for b in bits]
         for (i, b) in enumerate(bits):
             if b:
-                bytes[i//8] += (128, 64, 32, 16, 8, 4, 2, 1)[i % 8]
-        self._buf += bytes.tobytes()
+                arr[i//8] += (128, 64, 32, 16, 8, 4, 2, 1)[i % 8]
+        self._buf += arr.tobytes()
         return
 
 
@@ -608,7 +607,3 @@ def close(self) -> None:
         parser.close()
         fp.close()
     return
-
-
-if __name__ == '__main__':
-    main(sys.argv)