[modules/sensors] Remove unused imports and minor reformatting

bumblebee/modules/sensors.py

@@ -1,3 +1,4 @@
+# -*- coding: UTF-8 -*-
 # pylint: disable=C0111,R0903
 
 """Displays sensor temperature
@@ -11,9 +12,6 @@ Parameters:
 """
 
 import re
-import decimal
-
-from subprocess import call
 
 import bumblebee.input
 import bumblebee.output
@@ -24,6 +22,7 @@ class Module(bumblebee.engine.Module):
         super(Module, self).__init__(engine, config,
                                      bumblebee.output.Widget(full_text=self.temperature))
         self._temperature = "unknown"
+        self._mhz = "n/a"
         pattern = self.parameter("match", "temp1_input")
         pattern_string = r"^\s*{}:\s*([\d.]+)$".format(pattern)
         self._match_number = int(self.parameter("match_number", "-1"))
@@ -40,14 +39,14 @@ class Module(bumblebee.engine.Module):
         return temperature
 
     def get_mhz( self ):
-        output = open( '/proc/cpuinfo' ).read()
+        output = open("/proc/cpuinfo").read()
         m      = re.search(r"cpu MHz\s+:\s+(\d+)", output)
         mhz    = int(m.group(1))
 
         if mhz < 1000:
             return "{} MHz".format(mhz)
         else:
-            return "%.1f GHz" % ( decimal.Decimal( mhz ) / 1000 )
+            return "{:0.01f} GHz".format(float(mhz)/1000.0)
 
     def temperature(self, _):
         return u"{}°c @ {}".format(self._temperature, self._mhz)