python 2.7 is totally fine

bin/partftpy_client.py

@@ -107,7 +107,7 @@ def main():
         parser.print_help()
         sys.exit(1)
 
-    class Progress:
+    class Progress(object):
         def __init__(self, out):
             self.progress = 0
             self.out = out

partftpy/TftpClient.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module implements the TFTP Client functionality. Instantiate an
 instance of the client, and then use its upload or download method. Logging is
 performed via a standard logging object set in TftpShared."""
@@ -55,12 +58,8 @@ def download(
 
         Note: If output is a hyphen, stdout is used."""
         # We're downloading.
-        log.debug("Creating download context with the following params:")
-        log.debug(f"host = {self.host}, port = {self.iport}, filename = {filename}")
-        log.debug(
-            "options = %s, packethook = %s, timeout = %s"
-            % (self.options, packethook, timeout)
-        )
+        t = "DL-ctx: host = %s, port = %s, filename = %s, options = %s, packethook = %s, timeout = %s"
+        log.debug(t, self.host, self.iport, filename, self.options, packethook, timeout)
         self.context = TftpContextClientDownload(
             self.host,
             self.iport,

partftpy/TftpContexts.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module implements all contexts for state handling during uploads and
 downloads, the main interface to which being the TftpContext base class.
 
@@ -28,7 +31,7 @@
 ###############################################################################
 
 
-class TftpMetrics:
+class TftpMetrics(object):
     """A class representing metrics of the transfer."""
 
     def __init__(self):
@@ -78,7 +81,7 @@ def add_dup(self, pkt):
 ###############################################################################
 
 
-class TftpContext:
+class TftpContext(object):
     """The base class of the contexts."""
 
     def __init__(self, host, port, timeout, retries=DEF_TIMEOUT_RETRIES, localip=""):
@@ -247,7 +250,7 @@ def __init__(
         self.upload_open = upload_open
 
     def __str__(self):
-        return f"{self.host}:{self.port} {self.state}"
+        return "%s:%s %s" % (self.host, self.port, self.state)
 
     def start(self, buffer):
         """
@@ -314,7 +317,7 @@ def __init__(
         )
 
     def __str__(self):
-        return f"{self.host}:{self.port} {self.state}"
+        return "%s:%s %s" % (self.host, self.port, self.state)
 
     def start(self):
         log.info("Sending tftp upload request to %s" % self.host)
@@ -400,7 +403,7 @@ def __init__(
         )
 
     def __str__(self):
-        return f"{self.host}:{self.port} {self.state}"
+        return "%s:%s %s" % (self.host, self.port, self.state)
 
     def start(self):
         """Initiate the download."""

partftpy/TftpPacketFactory.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module implements the TftpPacketFactory class, which can take a binary
 buffer, and return the appropriate TftpPacket object to represent it, via the
 parse() method."""
@@ -12,7 +15,7 @@
 log = logging.getLogger("partftpy.TftpPacketFactory")
 
 
-class TftpPacketFactory:
+class TftpPacketFactory(object):
     """This class generates TftpPacket objects. It is responsible for parsing
     raw buffers off of the wire and returning objects representing them, via
     the parse() method."""

partftpy/TftpPacketTypes.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module implements the packet types of TFTP itself, and the
 corresponding encode and decode methods for them."""
 
@@ -12,15 +15,15 @@
 log = logging.getLogger("partftpy.TftpPacketTypes")
 
 
-class TftpSession:
+class TftpSession(object):
     """This class is the base class for the tftp client and server. Any shared
     code should be in this class."""
 
     # FIXME: do we need this anymore?
     pass
 
 
-class TftpPacketWithOptions:
+class TftpPacketWithOptions(object):
     """This class exists to permit some TftpPacket subclasses to share code
     regarding options handling. It does not inherit from TftpPacket, as the
     goal is just to share code here, and not cause diamond inheritance."""
@@ -99,7 +102,7 @@ def decode_options(self, buffer):
         return options
 
 
-class TftpPacket:
+class TftpPacket(object):
     """This class is the parent class of all tftp packet classes. It is an
     abstract class, providing an interface, and should not be instantiated
     directly."""

partftpy/TftpServer.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module implements the TFTP Server functionality. Instantiate an
 instance of the server, and then run the listen() method to listen for client
 requests. Logging is performed via a standard logging object set in
@@ -58,7 +61,7 @@ def __init__(self, tftproot="/tftpboot", dyn_file_func=None, upload_open=None):
         for name in "dyn_file_func", "upload_open":
             attr = getattr(self, name)
             if attr and not callable(attr):
-                raise TftpException(f"{name} supplied, but it is not callable.")
+                raise TftpException("%s supplied, but it is not callable." % (name,))
         if os.path.exists(self.root):
             log.debug("tftproot %s does exist", self.root)
             if not os.path.isdir(self.root):
@@ -92,7 +95,7 @@ def listen(
         # listenip = listenip if listenip else '0.0.0.0'
         if not listenip:
             listenip = "0.0.0.0"
-        log.info(f"Server requested on ip {listenip}, port {listenport}")
+        log.info("Server requested on ip %s, port %s" % (listenip, listenport))
         try:
             # FIXME - sockets should be non-blocking
             self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
@@ -163,7 +166,7 @@ def listen(
 
                     # Forge a session key based on the client's IP and port,
                     # which should safely work through NAT.
-                    key = f"{raddress}:{rport}"
+                    key = "%s:%s" % (raddress, rport)
 
                     if key not in self.sessions:
                         log.debug(

partftpy/TftpShared.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module holds all objects shared by all other modules in partftpy."""
 
 
@@ -28,7 +31,7 @@ def tftpassert(condition, msg):
         raise TftpException(msg)
 
 
-class TftpErrors:
+class TftpErrors(object):
     """This class is a convenience for defining the common tftp error codes,
     and making them more readable in the code."""
 

partftpy/TftpStates.py

@@ -1,4 +1,7 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """This module implements all state handling during uploads and downloads, the
 main interface to which being the TftpState base class.
 
@@ -25,7 +28,7 @@
 ###############################################################################
 
 
-class TftpState:
+class TftpState(object):
     """The base class for the states."""
 
     def __init__(self, context):
@@ -48,7 +51,7 @@ def handleOACK(self, pkt):
                 # Set options to OACK options
                 self.context.options = pkt.options
                 for key in self.context.options:
-                    log.info(f"    {key} = {self.context.options[key]}")
+                    log.info("    %s = %s", key, self.context.options[key])
             else:
                 log.error("Failed to negotiate options")
                 raise TftpException("Failed to negotiate options")
@@ -168,7 +171,7 @@ def sendOACK(self):
     def resendLast(self):
         """Resend the last sent packet due to a timeout."""
         assert( self.context.last_pkt is not None )
-        log.warning(f"Resending packet {self.context.last_pkt} on sessions {self}")
+        log.warning("Resending packet %s on sessions %s", self.context.last_pkt, self)
         self.context.metrics.resent_bytes += len(self.context.last_pkt.buffer)
         self.context.metrics.add_dup(self.context.last_pkt)
         sendto_port = self.context.tidport
@@ -335,7 +338,7 @@ def handle(self, pkt, raddress, rport):
         else:
             log.warning("File not found: %s", path)
             self.sendError(TftpErrors.FileNotFound)
-            raise TftpException(f"File not found: {path}")
+            raise TftpException("File not found: %s" % (path,))
 
         # Options negotiation.
         if sendoack and "tsize" in self.context.options:
@@ -630,7 +633,7 @@ def handle(self, pkt, raddress, rport):
             if pkt.errorcode == TftpErrors.FileNotFound:
                 raise TftpFileNotFoundError("File not found")
             else:
-                raise TftpException(f"Received ERR from server: {pkt}")
+                raise TftpException("Received ERR from server: %s" % (pkt,))
 
         else:
             self.sendError(TftpErrors.IllegalTftpOp)

partftpy/__init__.py

@@ -1,18 +1,14 @@
+# coding: utf-8
 # vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 """
 This library implements the tftp protocol, based on rfc 1350.
 http://www.faqs.org/rfcs/rfc1350.html
 """
 
-import sys
-
 import pkg_resources
 
-# Make sure that this is at least Python 3
-required_version = (3, 0)
-if sys.version_info < required_version:
-    raise ImportError("Requires at least Python 3.0")
-
 from . import __name__ as pkg_name
 
 

setup.py

@@ -1,4 +1,7 @@
-#!/usr/bin/env python
+# coding: utf-8
+# vim: ts=4 sw=4 et ai:
+from __future__ import print_function, unicode_literals
+
 # vim: ts=4 sw=4 et ai:
 import os
 
@@ -27,7 +30,7 @@ def read_file(fname):
             "setuptools_scm[toml]",
             "setuptools_scm_git_archive >= 1.0",
         ],
-        python_requires=">=3.6",
+        python_requires=">=2.7",
         classifiers=[
             "Programming Language :: Python :: 3",
             "Development Status :: 4 - Beta",