Python 2.5 compatibility

pokedex/__init__.py

@@ -55,8 +55,8 @@ def get_session(options):
     session = pokedex.db.connect(engine_uri)
 
     if options.verbose:
-        print "Connected to database {engine} (from {got_from})" \
-            .format(engine=session.bind.url, got_from=got_from)
+        print "Connected to database %(engine)s (from %(got_from)s)" \
+            % dict(engine=session.bind.url, got_from=got_from)
 
     return session
 
@@ -75,8 +75,8 @@ def get_lookup(options, session=None, recreate=False):
         index_dir, got_from = defaults.get_default_index_dir_with_origin()
 
     if options.verbose:
-        print "Opened lookup index {index_dir} (from {got_from})" \
-            .format(index_dir=index_dir, got_from=got_from)
+        print "Opened lookup index %(index_dir)s (from %(got_from)s)" \
+            % dict(index_dir=index_dir, got_from=got_from)
 
     lookup = pokedex.lookup.PokedexLookup(index_dir, session=session)
 
@@ -97,8 +97,8 @@ def get_csv_directory(options):
     if csvdir is None:
         csvdir, got_from = defaults.get_default_csv_dir_with_origin()
 
-    print "Using CSV directory {csvdir} (from {got_from})" \
-        .format(csvdir=csvdir, got_from=got_from)
+    print "Using CSV directory %(csvdir)s (from %(got_from)s)" \
+        % dict(csvdir=csvdir, got_from=got_from)
 
     return csvdir
 

pokedex/db/load.py

@@ -179,7 +179,7 @@ def load(session, tables=[], directory=None, drop_tables=False, verbose=False):
             session.commit()
             new_rows[:] = []
 
-            progress = "{0}%".format(100 * csvfile.tell() // csvsize)
+            progress = "%d%%" % (100 * csvfile.tell() // csvsize)
             print_status(progress)
 
         for csvs in reader:

pokedex/lookup.py

@@ -1,5 +1,4 @@
 # encoding: utf8
-from collections import namedtuple
 import os, os.path
 import random
 import re
@@ -15,6 +14,8 @@ from whoosh.qparser import QueryParser
 import whoosh.scoring
 import whoosh.spelling
 
+from pokedex.util import namedtuple
+
 from pokedex.db import connect
 import pokedex.db.tables as tables
 from pokedex.roomaji import romanize

pokedex/savefile.py

@@ -8,7 +8,8 @@ Kudos to LordLandon for his pkmlib.py, from which this module was originally
 derived.
 """
 
-import itertools, struct
+import struct
+from pokedex.util import permutations
 
 def pokemon_prng(seed):
     u"""Creates a generator that simulates the main Pokémon PRNG."""
@@ -79,7 +80,7 @@ class PokemonSave(object):
 
     ### Utility methods
 
-    shuffle_orders = list( itertools.permutations(range(4)) )
+    shuffle_orders = list( permutations(range(4)) )
 
     @classmethod
     def shuffle_chunks(cls, words, reverse=False):

pokedex/util.py

@@ -0,0 +1,148 @@
+"""Functions missing from Python 2.5"""
+
+try:
+    from itertools import permutations
+except ImportError:
+    # From the itertools documentation
+    def permutations(iterable, r=None):
+        # permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
+        # permutations(range(3)) --> 012 021 102 120 201 210
+        pool = tuple(iterable)
+        n = len(pool)
+        r = n if r is None else r
+        if r > n:
+            return
+        indices = range(n)
+        cycles = range(n, n-r, -1)
+        yield tuple(pool[i] for i in indices[:r])
+        while n:
+            for i in reversed(range(r)):
+                cycles[i] -= 1
+                if cycles[i] == 0:
+                    indices[i:] = indices[i+1:] + indices[i:i+1]
+                    cycles[i] = n - i
+                else:
+                    j = cycles[i]
+                    indices[i], indices[-j] = indices[-j], indices[i]
+                    yield tuple(pool[i] for i in indices[:r])
+                    break
+            else:
+                return
+
+try:
+    from collections import namedtuple
+except ImportError:
+    # http://code.activestate.com/recipes/500261-named-tuples/
+    from operator import itemgetter as _itemgetter
+    from keyword import iskeyword as _iskeyword
+    import sys as _sys
+
+    def namedtuple(typename, field_names, verbose=False, rename=False):
+        """Returns a new subclass of tuple with named fields.
+
+        >>> Point = namedtuple('Point', 'x y')
+        >>> Point.__doc__                   # docstring for the new class
+        'Point(x, y)'
+        >>> p = Point(11, y=22)             # instantiate with positional args or keywords
+        >>> p[0] + p[1]                     # indexable like a plain tuple
+        33
+        >>> x, y = p                        # unpack like a regular tuple
+        >>> x, y
+        (11, 22)
+        >>> p.x + p.y                       # fields also accessable by name
+        33
+        >>> d = p._asdict()                 # convert to a dictionary
+        >>> d['x']
+        11
+        >>> Point(**d)                      # convert from a dictionary
+        Point(x=11, y=22)
+        >>> p._replace(x=100)               # _replace() is like str.replace() but targets named fields
+        Point(x=100, y=22)
+
+        """
+
+        # Parse and validate the field names.  Validation serves two purposes,
+        # generating informative error messages and preventing template injection attacks.
+        if isinstance(field_names, basestring):
+            field_names = field_names.replace(',', ' ').split() # names separated by whitespace and/or commas
+        field_names = tuple(map(str, field_names))
+        if rename:
+            names = list(field_names)
+            seen = set()
+            for i, name in enumerate(names):
+                if (not min(c.isalnum() or c=='_' for c in name) or _iskeyword(name)
+                    or not name or name[0].isdigit() or name.startswith('_')
+                    or name in seen):
+                        names[i] = '_%d' % i
+                seen.add(name)
+            field_names = tuple(names)
+        for name in (typename,) + field_names:
+            if not min(c.isalnum() or c=='_' for c in name):
+                raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name)
+            if _iskeyword(name):
+                raise ValueError('Type names and field names cannot be a keyword: %r' % name)
+            if name[0].isdigit():
+                raise ValueError('Type names and field names cannot start with a number: %r' % name)
+        seen_names = set()
+        for name in field_names:
+            if name.startswith('_') and not rename:
+                raise ValueError('Field names cannot start with an underscore: %r' % name)
+            if name in seen_names:
+                raise ValueError('Encountered duplicate field name: %r' % name)
+            seen_names.add(name)
+
+        # Create and fill-in the class template
+        numfields = len(field_names)
+        argtxt = repr(field_names).replace("'", "")[1:-1]   # tuple repr without parens or quotes
+        reprtxt = ', '.join('%s=%%r' % name for name in field_names)
+        template = '''class %(typename)s(tuple):
+            '%(typename)s(%(argtxt)s)' \n
+            __slots__ = () \n
+            _fields = %(field_names)r \n
+            def __new__(_cls, %(argtxt)s):
+                return _tuple.__new__(_cls, (%(argtxt)s)) \n
+            @classmethod
+            def _make(cls, iterable, new=tuple.__new__, len=len):
+                'Make a new %(typename)s object from a sequence or iterable'
+                result = new(cls, iterable)
+                if len(result) != %(numfields)d:
+                    raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
+                return result \n
+            def __repr__(self):
+                return '%(typename)s(%(reprtxt)s)' %% self \n
+            def _asdict(self):
+                'Return a new dict which maps field names to their values'
+                return dict(zip(self._fields, self)) \n
+            def _replace(_self, **kwds):
+                'Return a new %(typename)s object replacing specified fields with new values'
+                result = _self._make(map(kwds.pop, %(field_names)r, _self))
+                if kwds:
+                    raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
+                return result \n
+            def __getnewargs__(self):
+                return tuple(self) \n\n''' % locals()
+        for i, name in enumerate(field_names):
+            template += '            %s = _property(_itemgetter(%d))\n' % (name, i)
+        if verbose:
+            print template
+
+        # Execute the template string in a temporary namespace
+        namespace = dict(_itemgetter=_itemgetter, __name__='namedtuple_%s' % typename,
+                         _property=property, _tuple=tuple)
+        try:
+            exec template in namespace
+        except SyntaxError, e:
+            raise SyntaxError(e.message + ':\n' + template)
+        result = namespace[typename]
+
+        # For pickling to work, the __module__ variable needs to be set to the frame
+        # where the named tuple is created.  Bypass this step in enviroments where
+        # sys._getframe is not defined (Jython for example) or sys._getframe is not
+        # defined for arguments greater than 0 (IronPython).
+        try:
+            result.__module__ = _sys._getframe(1).f_globals.get('__name__', '__main__')
+        except (AttributeError, ValueError):
+            pass
+
+        return result
+