tweak raise/dict syntax for Python 3 compat

Use the `raise` statement directly.

Switch to using .items() instead of .iteritems().  Python 3 doesn't
have .iteritems() as .items() is a generator, and these are small
enough that the Python 2 overhead should be negligible.

We have to run .keys() through list() in a few places as Python 3
uses a generator and we sometimes want to iterate more than once.
That's why we don't change all .keys() or .items() calls -- most
are in places where generators are fine.

Bug: https://crbug.com/gerrit/10418
Change-Id: I469899d9b77ffd77ccabb831bc4b217407fefe6f

gitc_utils.py

@@ -58,8 +58,8 @@ def _set_project_revisions(projects):
       sys.exit(1)
     revisionExpr = gitcmd.stdout.split('\t')[0]
     if not revisionExpr:
-      raise(ManifestParseError('Invalid SHA-1 revision project %s (%s)' %
-                               (proj.remote.url, proj.revisionExpr)))
+      raise ManifestParseError('Invalid SHA-1 revision project %s (%s)' %
+                               (proj.remote.url, proj.revisionExpr))
     proj.revisionExpr = revisionExpr
 
 def _manifest_groups(manifest):
@@ -87,7 +87,7 @@ def generate_gitc_manifest(gitc_manifest, manifest, paths=None):
   print('Generating GITC Manifest by fetching revision SHAs for each '
         'project.')
   if paths is None:
-    paths = manifest.paths.keys()
+    paths = list(manifest.paths.keys())
 
   groups = [x for x in re.split(r'[,\s]+', _manifest_groups(manifest)) if x]
 
@@ -96,7 +96,7 @@ def generate_gitc_manifest(gitc_manifest, manifest, paths=None):
   projects = [p for p in projects if p.MatchesGroups(groups)]
 
   if gitc_manifest is not None:
-    for path, proj in manifest.paths.iteritems():
+    for path, proj in manifest.paths.items():
       if not proj.MatchesGroups(groups):
         continue
 
@@ -124,7 +124,7 @@ def generate_gitc_manifest(gitc_manifest, manifest, paths=None):
     index += NUM_BATCH_RETRIEVE_REVISIONID
 
   if gitc_manifest is not None:
-    for path, proj in gitc_manifest.paths.iteritems():
+    for path, proj in gitc_manifest.paths.items():
       if proj.old_revision and path in paths:
         # If we updated a project that has been started, keep the old-revision
         # updated.
@@ -133,7 +133,7 @@ def generate_gitc_manifest(gitc_manifest, manifest, paths=None):
         repo_proj.revisionExpr = None
 
   # Convert URLs from relative to absolute.
-  for _name, remote in manifest.remotes.iteritems():
+  for _name, remote in manifest.remotes.items():
     remote.fetchUrl = remote.resolvedFetchUrl
 
   # Save the manifest.

subcmds/abandon.py

@@ -58,7 +58,7 @@ It is equivalent to "git branch -D <branchname>".
       pm.update()
 
       if opt.all:
-        branches = project.GetBranches().keys()
+        branches = list(project.GetBranches().keys())
       else:
         branches = [nb]
 

subcmds/info.py

@@ -99,7 +99,7 @@ class Info(PagedCommand):
       self.headtext(p.revisionExpr)
       self.out.nl()
 
-      localBranches = p.GetBranches().keys()
+      localBranches = list(p.GetBranches().keys())
       self.heading("Local Branches: ")
       self.redtext(str(len(localBranches)))
       if len(localBranches) > 0: