command.py: Cleaned up pylint/pep8 violations

I noticed when running pylint (as the SUBMITTING_PATCHES file directs)
that there were a few violations reported. This makes it difficult
to see violations I might have introduced. This commit corrects all
pylint violations in the command.py script.

This script now has a pylint score of 10.0.

Change-Id: Ibb35fa9af0e0b9b40e02ae043682b3af23286748

command.py

@@ -31,7 +31,7 @@ class Command(object):
   manifest = None
   _optparse = None
 
-  def WantPager(self, opt):
+  def WantPager(self, _opt):
     return False
 
   def ReadEnvironmentOptions(self, opts):
@@ -63,7 +63,7 @@ class Command(object):
         usage = self.helpUsage.strip().replace('%prog', me)
       except AttributeError:
         usage = 'repo %s' % self.NAME
-      self._optparse = optparse.OptionParser(usage = usage)
+      self._optparse = optparse.OptionParser(usage=usage)
       self._Options(self._optparse)
     return self._optparse
 
@@ -110,9 +110,9 @@ class Command(object):
     project = None
     if os.path.exists(path):
       oldpath = None
-      while path \
-        and path != oldpath \
-        and path != manifest.topdir:
+      while path and \
+            path != oldpath and \
+            path != manifest.topdir:
         try:
           project = self._by_path[path]
           break
@@ -138,7 +138,7 @@ class Command(object):
     mp = manifest.manifestProject
 
     if not groups:
-        groups = mp.config.GetString('manifest.groups')
+      groups = mp.config.GetString('manifest.groups')
     if not groups:
       groups = 'default,platform-' + platform.system().lower()
     groups = [x for x in re.split(r'[,\s]+', groups) if x]
@@ -151,8 +151,7 @@ class Command(object):
                                   for p in project.GetDerivedSubprojects())
       all_projects_list.extend(derived_projects.values())
       for project in all_projects_list:
-        if ((missing_ok or project.Exists) and
-            project.MatchesGroups(groups)):
+        if (missing_ok or project.Exists) and project.MatchesGroups(groups):
           result.append(project)
     else:
       self._ResetPathToProjectMap(all_projects_list)
@@ -166,8 +165,8 @@ class Command(object):
 
           # If it's not a derived project, update path->project mapping and
           # search again, as arg might actually point to a derived subproject.
-          if (project and not project.Derived and
-              (submodules_ok or project.sync_s)):
+          if (project and not project.Derived and (submodules_ok or
+                                                   project.sync_s)):
             search_again = False
             for subproject in project.GetDerivedSubprojects():
               self._UpdatePathToProjectMap(subproject)
@@ -205,6 +204,7 @@ class Command(object):
     result.sort(key=lambda project: project.relpath)
     return result
 
+
 # pylint: disable=W0223
 # Pylint warns that the `InteractiveCommand` and `PagedCommand` classes do not
 # override method `Execute` which is abstract in `Command`.  Since that method
@@ -214,28 +214,32 @@ class InteractiveCommand(Command):
   """Command which requires user interaction on the tty and
      must not run within a pager, even if the user asks to.
   """
-  def WantPager(self, opt):
+  def WantPager(self, _opt):
     return False
 
+
 class PagedCommand(Command):
   """Command which defaults to output in a pager, as its
      display tends to be larger than one screen full.
   """
-  def WantPager(self, opt):
+  def WantPager(self, _opt):
     return True
 
 # pylint: enable=W0223
 
+
 class MirrorSafeCommand(object):
   """Command permits itself to run within a mirror,
      and does not require a working directory.
   """
 
+
 class GitcAvailableCommand(object):
   """Command that requires GITC to be available, but does
      not require the local client to be a GITC client.
   """
 
+
 class GitcClientCommand(object):
   """Command that requires the local client to be a GITC
      client.