Minor code cleanup in arc_summary.py

Simplify and inline single-use function div1(); inline twice-used
function div2(); add function comment to zfs_header(); replace
variable "unused" in get_Kstat() with "_" following convention.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Signed-off-by: Scot W. Stevenson <[email protected]>
Closes #6802 

1 files changed, 8 insertions, 17 deletions

diff --git a/cmd/arc_summary/arc_summary.py b/cmd/arc_summary/arc_summary.py
index e19278cef..6b818edc7 100755
--- a/cmd/arc_summary/arc_summary.py
+++ b/cmd/arc_summary/arc_summary.py
@@ -63,7 +63,7 @@ def get_Kstat():
         del kstats[0:2]
         for kstat in kstats:
             kstat = kstat.strip()
-            name, unused, value = kstat.split()
+            name, _, value = kstat.split()
             Kstat[namespace + name] = D(value)
 
     Kstat = {}
@@ -77,17 +77,6 @@ def get_Kstat():
     return Kstat
 
 
-def div1():
-    sys.stdout.write("\n")
-    for i in range(18):
-        sys.stdout.write("%s" % "----")
-    sys.stdout.write("\n")
-
-
-def div2():
-    sys.stdout.write("\n")
-
-
 def fBytes(b=0):
     """Return human-readable representation of a byte value in
     powers of 2 (eg "KiB" for "kibibytes", etc) to two decimal
@@ -908,11 +897,13 @@ unSub = [
 
 
 def zfs_header():
-    daydate = time.strftime("%a %b %d %H:%M:%S %Y")
+    """Print title string with date
+    """
+    daydate = time.strftime('%a %b %d %H:%M:%S %Y')
 
-    div1()
-    sys.stdout.write("ZFS Subsystem Report\t\t\t\t%s" % daydate)
-    div2()
+    sys.stdout.write('\n'+'-'*72+'\n')
+    sys.stdout.write('ZFS Subsystem Report\t\t\t\t%s' % daydate)
+    sys.stdout.write('\n')
 
 
 def usage():
@@ -975,7 +966,7 @@ def main():
     zfs_header()
     for page in pages:
         page(Kstat)
-        div2()
+        sys.stdout.write("\n")
 
 
 if __name__ == '__main__':