Run 'black' on gdb

Running 'black' on gdb fixed a couple of small issues.  This patch is
the result.

gdb/python/lib/gdb/__init__.py

@@ -30,7 +30,8 @@ from _gdb import *
 # Historically, gdb.events was always available, so ensure it's
 # still available without an explicit import.
 import _gdbevents as events
-sys.modules['gdb.events'] = events
+
+sys.modules["gdb.events"] = events
 
 
 class _GdbFile(object):
@@ -243,9 +244,9 @@ def set_parameter(name, value):
     # can return them, but they can't be passed to 'set' this way.
     if isinstance(value, bool):
         if value:
-            value = 'on'
+            value = "on"
         else:
-            value = 'off'
+            value = "off"
     execute("set " + name + " " + str(value), to_string=True)
 
 

gdb/testsuite/gdb.python/py-send-packet.py

@@ -114,10 +114,12 @@ def check_global_var(expected_val):
     if val != expected_val:
         raise gdb.GdbError("global_var is 0x%x, expected 0x%x" % (val, expected_val))
 
+
 # Return a bytes object representing an 'X' packet header with
 # address ADDR.
-def xpacket_header (addr):
-    return ("X%x,4:" % addr).encode('ascii')
+def xpacket_header(addr):
+    return ("X%x,4:" % addr).encode("ascii")
+
 
 # Set the 'X' packet to the remote target to set a global variable.
 # Checks that we can send byte values.