Fix #133: Remove rsa/_compat.py

There were very few functions in there, and none of them were actually used
by the RSA library (just by the test code).

Author: sybrenstuvel

rsa/_compat.py

@@ -15,20 +15,9 @@
 
 import unittest
 import struct
-from rsa._compat import byte
 from rsa.common import byte_size, bit_size, inverse
 
 
-class TestByte(unittest.TestCase):
-    def test_values(self):
-        self.assertEqual(byte(0), b"\x00")
-        self.assertEqual(byte(255), b"\xff")
-
-    def test_struct_error_when_out_of_bounds(self):
-        self.assertRaises(struct.error, byte, 256)
-        self.assertRaises(struct.error, byte, -1)
-
-
 class TestByteSize(unittest.TestCase):
     def test_values(self):
         self.assertEqual(byte_size(1 << 1023), 128)

tests/test_common.py

@@ -20,7 +20,6 @@
 
 import rsa
 from rsa import pkcs1
-from rsa._compat import byte
 
 
 class BinaryTest(unittest.TestCase):
@@ -48,7 +47,7 @@ def test_decoding_failure(self):
         self.assertIsInstance(a, int)
 
         altered_a = (a + 1) % 256
-        encrypted = encrypted[:5] + byte(altered_a) + encrypted[6:]
+        encrypted = encrypted[:5] + bytes([altered_a]) + encrypted[6:]
 
         self.assertRaises(pkcs1.DecryptionError, pkcs1.decrypt, encrypted, self.priv)