From ebb5d702a7bff096a75280b1709f5e061857b7d4 Mon Sep 17 00:00:00 2001
From: Markus Volk <f_l_k@t-online.de>
Date: Mon, 21 Sep 2026 13:24:42 +0200
Subject: [PATCH] drop the six dependency

six is a Python 2 compatibility shim and smpplib does not need it on
Python 3: six.iteritems is dict.items, six.int2byte is bytes of a single
value and six.b encodes as latin-1.

Upstream-Status: Pending

AI-Generated: Uses Claude Code (Claude Opus 5)
---
 setup.py                 | 1 -
 smpplib/command.py       | 8 +++-----
 smpplib/command_codes.py | 4 +---
 smpplib/gsm.py           | 8 +++-----
 4 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/setup.py b/setup.py
index b12fc31..b3ef37e 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,6 @@ setup(
     url='https://github.com/python-smpplib/python-smpplib',
     description='SMPP library for python',
     packages=find_packages(),
-    install_requires=['six'],
     extras_require=dict(
         tests=('typing; python_version < "3.5"', 'pytest', 'mock'),
     ),
diff --git a/smpplib/command.py b/smpplib/command.py
index bde5840..40fcac7 100644
--- a/smpplib/command.py
+++ b/smpplib/command.py
@@ -22,8 +22,6 @@
 import logging
 import struct
 
-import six
-
 from smpplib import consts, exceptions, pdu
 from smpplib.ptypes import flag, ostr
 
@@ -64,7 +62,7 @@ def get_optional_name(code):
     """Return optional_params name by given code. If code is unknown, raise
     UnkownCommandError exception"""
 
-    for key, value in six.iteritems(consts.OPTIONAL_PARAMS):
+    for key, value in consts.OPTIONAL_PARAMS.items():
         if value == code:
             return key
 
@@ -106,7 +104,7 @@ class Command(pdu.PDU):
 
     def _set_vars(self, **kwargs):
         """set attributes accordingly to kwargs"""
-        for key, value in six.iteritems(kwargs):
+        for key, value in kwargs.items():
             if not hasattr(self, key) or getattr(self, key) is None:
                 setattr(self, key, value)
 
@@ -179,7 +177,7 @@ class Command(pdu.PDU):
                 value = chr(0)
 
         setattr(self, field, field_value)
-        return six.b(value)
+        return value.encode('latin-1')
 
     def _generate_ostring(self, field):
         """Generate octet string value (no null terminator)"""
diff --git a/smpplib/command_codes.py b/smpplib/command_codes.py
index eab6868..a0fc53e 100644
--- a/smpplib/command_codes.py
+++ b/smpplib/command_codes.py
@@ -1,5 +1,3 @@
-import six
-
 from smpplib import exceptions
 
 #
@@ -42,7 +40,7 @@ def get_command_name(code):
     If code is unknown, raise UnknownCommandError exception.
     """
 
-    for key, value in six.iteritems(commands):
+    for key, value in commands.items():
         if value == code:
             return key
 
diff --git a/smpplib/gsm.py b/smpplib/gsm.py
index 9d70f98..77c6d0e 100644
--- a/smpplib/gsm.py
+++ b/smpplib/gsm.py
@@ -1,8 +1,6 @@
 # -*- coding: utf8 -*-
 import random
 
-import six
-
 from smpplib import consts, exceptions
 
 
@@ -55,7 +53,7 @@ def gsm_encode(plaintext):
     """Performs default GSM 7-bit encoding. Beware it's vendor-specific and not recommended for use."""
     try:
         return b''.join(
-            six.int2byte(index) if index < 0x80 else b'\x1B' + six.int2byte(index - 0x80)
+            bytes((index,)) if index < 0x80 else b'\x1B' + bytes((index - 0x80,))
             for index in map(GSM_CHARACTER_TABLE.index, plaintext)
         )
     except ValueError:
@@ -78,9 +76,9 @@ def make_parts_encoded(encoded_text, part_size):
         raise exceptions.MessageTooLong()
 
     uid = random.randint(0, 255)
-    header = b''.join((b'\x05\x00\x03', six.int2byte(uid), six.int2byte(len(chunks))))
+    header = b''.join((b'\x05\x00\x03', bytes((uid,)), bytes((len(chunks),))))
 
-    return [b''.join((header, six.int2byte(i), chunk)) for i, chunk in enumerate(chunks, start=1)]
+    return [b''.join((header, bytes((i,)), chunk)) for i, chunk in enumerate(chunks, start=1)]
 
 
 def split_sequence(sequence, part_size):