[tests] Rename segwit encode and decode functions

These functions can be exported to other modules,
so be explicit that they're encoding and decoding
segwit addresses

test/functional/test_framework/address.py

@@ -8,9 +8,9 @@ import enum
 import unittest
 
 from .script import hash256, hash160, sha256, CScript, OP_0
+from .segwit_addr import encode_segwit_address
 from .util import hex_str_to_bytes
 
-from . import segwit_addr
 
 from test_framework.util import assert_equal
 
@@ -100,7 +100,7 @@ def program_to_witness(version, program, main = False):
     assert 0 <= version <= 16
     assert 2 <= len(program) <= 40
     assert version > 0 or len(program) in [20, 32]
-    return segwit_addr.encode("bc" if main else "bcrt", version, program)
+    return encode_segwit_address("bc" if main else "bcrt", version, program)
 
 def script_to_p2wsh(script, main = False):
     script = check_script(script)

test/functional/test_framework/segwit_addr.py

@@ -84,7 +84,7 @@ def convertbits(data, frombits, tobits, pad=True):
     return ret
 
 
-def decode(hrp, addr):
+def decode_segwit_address(hrp, addr):
     """Decode a segwit address."""
     hrpgot, data = bech32_decode(addr)
     if hrpgot != hrp:
@@ -99,10 +99,10 @@ def decode(hrp, addr):
     return (data[0], decoded)
 
 
-def encode(hrp, witver, witprog):
+def encode_segwit_address(hrp, witver, witprog):
     """Encode a segwit address."""
     ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5))
-    if decode(hrp, ret) == (None, None):
+    if decode_segwit_address(hrp, ret) == (None, None):
         return None
     return ret
 
@@ -111,8 +111,8 @@ class TestFrameworkScript(unittest.TestCase):
         def test_python_bech32(addr):
             hrp = addr[:4]
             self.assertEqual(hrp, "bcrt")
-            (witver, witprog) = decode(hrp, addr)
-            self.assertEqual(encode(hrp, witver, witprog), addr)
+            (witver, witprog) = decode_segwit_address(hrp, addr)
+            self.assertEqual(encode_segwit_address(hrp, witver, witprog), addr)
 
         # P2WPKH
         test_python_bech32('bcrt1qthmht0k2qnh3wy7336z05lu2km7emzfpm3wg46')