[FIX] iterator definition & stepping

* in P3, the iterator stepping method has become a dunder method (next
  -> __next__), the protocol has not changed, add a __next__ alias to
  the iterator-next definition (nota: ir.config also has a next method
  but it's not part of an iterator, so don't alias it and don't
  convert calls to it)
* since ~2.6, a builtin (next()) has been added to step an iterator &
  allow for a default (in case of iterator end), convert all manual
  stepping to the builtin

Fixers:
    libfuturize.fixes.fix_next_call

#8530

addons/l10n_lu/scripts/tax2csv.py

@@ -59,7 +59,7 @@ class LuxTaxGenerator:
         writer = csv.writer(open('account.tax.code.template-%s.csv' %
                                  self.suffix, 'wb'))
         tax_codes_iterator = self.iter_tax_codes()
-        keys = tax_codes_iterator.next()
+        keys = next(tax_codes_iterator)
         writer.writerow(keys)
 
         # write structure tax codes
@@ -87,7 +87,7 @@ class LuxTaxGenerator:
                 new_tax_codes[tax_code_id] = (new_name, new_parent_code)
 
         taxes_iterator = self.iter_taxes()
-        keys = taxes_iterator.next()
+        next(taxes_iterator)
         for row in taxes_iterator:
             if not _is_true(row['active']):
                 continue
@@ -157,7 +157,7 @@ class LuxTaxGenerator:
         writer = csv.writer(open('account.tax.template-%s.csv' %
                                  self.suffix, 'wb'))
         taxes_iterator = self.iter_taxes()
-        keys = taxes_iterator.next()
+        keys = next(taxes_iterator)
         writer.writerow(keys[3:] + ['sequence'])
         seq = 100
         for row in sorted(taxes_iterator, key=lambda r: r['description']):
@@ -175,7 +175,7 @@ class LuxTaxGenerator:
                                  'position.tax.template-%s.csv' %
                                  self.suffix, 'wb'))
         fiscal_pos_map_iterator = self.iter_fiscal_pos_map()
-        keys = fiscal_pos_map_iterator.next()
+        keys = next(fiscal_pos_map_iterator)
         writer.writerow(keys)
         for row in fiscal_pos_map_iterator:
             writer.writerow(map(_e, row.values()))

odoo/tools/convert.py

@@ -850,7 +850,7 @@ def convert_csv_import(cr, module, fname, csvcontent, idref=None, mode='init',
 
     input = cStringIO.StringIO(csvcontent) #FIXME
     reader = csv.reader(input, quotechar='"', delimiter=',')
-    fields = reader.next()
+    fields = next(reader)
 
     if not (mode == 'init' or 'id' in fields):
         _logger.error("Import specification does not contain 'id' and we are in init mode, Cannot continue.")

odoo/tools/misc.py

@@ -376,7 +376,7 @@ def scan_languages():
         result = []
         with open(csvpath) as csvfile:
             reader = csv.reader(csvfile, delimiter=',', quotechar='"')
-            fields = reader.next()
+            fields = next(reader)
             code_index = fields.index("code")
             name_index = fields.index("name")
             for row in reader:
@@ -833,6 +833,7 @@ class CountingStream(object):
             self.stopped = True
             raise StopIteration()
         return val
+    __next__ = next
 
 def stripped_sys_argv(*strip_args):
     """Return sys.argv with some arguments stripped, suitable for reexecution or subprocesses"""

odoo/tools/translate.py

@@ -533,7 +533,7 @@ class PoFile(object):
                         raise StopIteration()
                     line = self.lines.pop(0)
                 # This has been a deprecated entry, don't return anything
-                return self.next()
+                return next(self)
 
             if not line.startswith('msgid'):
                 raise Exception("malformed file: bad line: %s" % line)
@@ -547,7 +547,7 @@ class PoFile(object):
                 self.extra_lines = []
                 while line:
                     line = self.lines.pop(0).strip()
-                return self.next()
+                return next(self)
 
             while not line.startswith('msgstr'):
                 if not line:
@@ -574,8 +574,9 @@ class PoFile(object):
             if not fuzzy:
                 _logger.warning('Missing "#:" formated comment at line %d for the following source:\n\t%s',
                                 self.cur_line(), source[:30])
-            return self.next()
+            return next(self)
         return trans_type, name, res_id, source, trad, '\n'.join(comments)
+    __next__ = next
 
     def write_infos(self, modules):
         import odoo.release as release

odoo/tools/which.py

@@ -44,6 +44,7 @@ __all__ = 'which which_files pathsep defpath defpathext F_OK R_OK W_OK X_OK'.spl
 import sys
 from os import access, defpath, pathsep, environ, F_OK, R_OK, W_OK, X_OK
 from os.path import exists, dirname, split, join
+ENOENT = 2
 
 windows = sys.platform.startswith('win')
 
@@ -138,15 +139,10 @@ def which(file, mode=F_OK | X_OK, path=None, pathext=None):
 
         >>> # for doctest see which_files()
     """
-    try:
-        return iter(which_files(file, mode, path, pathext)).next()
-    except StopIteration:
-        try:
-            from errno import ENOENT
-        except ImportError:
-            ENOENT = 2
+    path = next(which_files(file, mode, path, pathext), None)
+    if path is None:
         raise IOError(ENOENT, '%s not found' % (mode & X_OK and 'command' or 'file'), file)
-
+    return path
 
 if __name__ == '__main__':
     import doctest