Fix multiple Python 3 compatibility issues

Changes in Python 3 that made the code choke:

  o basestring is merged into str
  o print() needs parentesis
  o Class inheritance syntax changed
  o Abstract baseclass (ABCMeta) syntax changed
  o map.iteritems() is replaced by map.items()
  o Inconsistent use of tabs and spaces are no longer tolerated

Signed-off-by: Jan Lindemann <jan@janware.com>

tools/python/jwutils/Cmd.py

@@ -1,26 +1,25 @@
-from abc import ABCMeta, abstractmethod
-
+import abc
 import argparse
-import Object
 
-class Cmd(Object.Object): # export
+# compatible with Python 2 *and* 3
+ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
 
-    __metaclass__=ABCMeta
+class Cmd(ABC): # export
 
-    @abstractmethod
+    @abc.abstractmethod
     def run(self, args):
         pass
 
     def __init__(self, name, help):
-	self.name = name
+        self.name = name
         self.help = help
 
     def _run(self, args):
         pass
 
     def add_parser(self, parsers):
-	r = parsers.add_parser(self.name, help=self.help,
+        r = parsers.add_parser(self.name, help=self.help,
             formatter_class=argparse.ArgumentDefaultsHelpFormatter)
-	r.set_defaults(func=self.run)
+        r.set_defaults(func=self.run)
         return r
 

tools/python/jwutils/Cmds.py

@@ -1,13 +1,13 @@
 import os
 import sys
 import argparse
-import Object
-import jwutils.log
+import jwutils
 import importlib
 import inspect
 import re
+import pickle
 
-class Cmds(Object.Object): # export
+class Cmds: # export
 
     def __init__(self, description = '', filter = '^Cmd.*', modules=None):
         self.__description = description

tools/python/jwutils/Object.py

@@ -1,3 +1,4 @@
+from __future__ import print_function
 import jwutils.log
 
 class Object(object): # export
@@ -14,7 +15,7 @@ class Object(object): # export
             for count, thing in enumerate(args):
                 msg += ' ' + str(*thing)
             if len(msg):
-                print msg[1:]
+                print(msg[1:])
 
     def debug(self, *args):
         jwutils.log.slog(jwutils.log.DEBUG, args)

tools/python/jwutils/algo/ShuntingYard.py

@@ -2,6 +2,12 @@ from collections import namedtuple
 import re
 import shlex
 
+# --- python 2 / 3 compatibility stuff
+try:
+    basestring
+except NameError:
+    basestring = str
+
 L, R = 'Left Right'.split()
 ARG, KEYW, QUOTED, LPAREN, RPAREN = 'arg kw quoted ( )'.split()
 
@@ -49,7 +55,7 @@ class ShuntingYard(object): # export
             for count, thing in enumerate(args):
                 msg += ' ' + str(thing)
             if len(msg):
-                print msg[1:]
+                print(msg[1:])
 
     def token_string(self):
         r = ""
@@ -65,7 +71,7 @@ class ShuntingYard(object): # export
 
         if len(r):
             return r[2:]
-	return r
+        return r
 
     def tokenize(self, spec):
 
@@ -162,9 +168,9 @@ class ShuntingYard(object): # export
         if self.do_debug:
             maxcolwidths = [len(max(x, key=len)) for x in zip(*table)]
             row = table[0]
-            print( ' '.join('{cell:^{width}}'.format(width=width, cell=cell) for (width, cell) in zip(maxcolwidths, row)))
+            print(' '.join('{cell:^{width}}'.format(width=width, cell=cell) for (width, cell) in zip(maxcolwidths, row)))
             for row in table[1:]:
-                print( ' '.join('{cell:<{width}}'.format(width=width, cell=cell) for (width, cell) in zip(maxcolwidths, row)))
+                print(' '.join('{cell:<{width}}'.format(width=width, cell=cell) for (width, cell) in zip(maxcolwidths, row)))
         return table[-1][2]
 
     def infix_to_postfix_orig(self, infix):

tools/python/jwutils/log.py

@@ -3,7 +3,13 @@ import syslog
 import sys
 import inspect
 from os.path import basename
-import misc
+from . import misc
+
+# --- python 2 / 3 compatibility stuff
+try:
+    basestring
+except NameError:
+    basestring = str
 
 EMERG = syslog.LOG_EMERG
 ALERT = syslog.LOG_ALERT