[pushed] Remove unused imports from gdb's Python code

[Tom Tromey <tromey@adacore.com>]

The "sys" import is unused in several Python files.  This removes this
line from all the places where it is unnecessary.
---
 gdb/python/lib/gdb/command/explore.py         | 1 -
 gdb/python/lib/gdb/printer/bound_registers.py | 2 --
 gdb/python/lib/gdb/printing.py                | 1 -
 gdb/python/lib/gdb/xmethod.py                 | 1 -
 4 files changed, 5 deletions(-)

diff --git a/gdb/python/lib/gdb/command/explore.py b/gdb/python/lib/gdb/command/explore.py
index db72f33e9db..821bfb081ea 100644
--- a/gdb/python/lib/gdb/command/explore.py
+++ b/gdb/python/lib/gdb/command/explore.py
@@ -17,7 +17,6 @@
 """Implementation of the GDB 'explore' command using the GDB Python API."""
 
 import gdb
-import sys
 
 
 class Explorer(object):
diff --git a/gdb/python/lib/gdb/printer/bound_registers.py b/gdb/python/lib/gdb/printer/bound_registers.py
index e1566750ec0..08f30cbf286 100644
--- a/gdb/python/lib/gdb/printer/bound_registers.py
+++ b/gdb/python/lib/gdb/printer/bound_registers.py
@@ -14,8 +14,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import sys
-
 import gdb.printing
 
 
diff --git a/gdb/python/lib/gdb/printing.py b/gdb/python/lib/gdb/printing.py
index d6b7b85e404..740a96e60eb 100644
--- a/gdb/python/lib/gdb/printing.py
+++ b/gdb/python/lib/gdb/printing.py
@@ -19,7 +19,6 @@
 import gdb
 import gdb.types
 import re
-import sys
 
 
 class PrettyPrinter(object):
diff --git a/gdb/python/lib/gdb/xmethod.py b/gdb/python/lib/gdb/xmethod.py
index ab6cd28c303..ef7d2011e1c 100644
--- a/gdb/python/lib/gdb/xmethod.py
+++ b/gdb/python/lib/gdb/xmethod.py
@@ -18,7 +18,6 @@
 
 import gdb
 import re
-import sys
 
 
 class XMethod(object):
-- 
2.39.1