btt_plot.py: Fix pylint: singleton-comparison

Comparison to None should be 'expr is None'

Signed-off-by: Vincent Legoll <vincent.legoll@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/btt/btt_plot.py b/btt/btt_plot.py
index d6d27aa32f09fea1366fafbe4b72635e31f0f5fd..653ace760758414ed0ec08446d9cb9f2b2434643 100755 (executable)
--- a/btt/btt_plot.py
+++ b/btt/btt_plot.py
@@ -113,8 +113,8 @@ def get_data(files):
                """Returns new min, max, and float value for those passed in"""
 
                v = float(v)
-               if mn == None or v < mn: mn = v
-               if mx == None or v > mx: mx = v
+               if mn is None or v < mn: mn = v
+               if mx is None or v > mx: mx = v
                return mn, mx, v
 
        #--------------------------------------------------------------
@@ -235,7 +235,7 @@ def parse_args(args):
                elif o in ('-v', '--verbose'):
                        verbose = True
 
-       if type == None and not generate_all:
+       if type is None and not generate_all:
                fatal('Need type of data files to process - (-t <type>)')
 
        return args
@@ -244,7 +244,7 @@ def parse_args(args):
 def gen_title(fig, type, title_str):
        """Sets the title for the figure based upon the type /or/ user title"""
 
-       if title_str != None:
+       if title_str is not None:
                pass
        elif type == 'aqd':
                title_str = 'Average Queue Depth'
@@ -309,7 +309,7 @@ def generate_output(type, db):
        #----------------------------------------------------------------------
        global add_legend, output_file, title_str, verbose
 
-       if output_file != None:
+       if output_file is not None:
                ofile = output_file
        else:
                ofile = '%s.png' % type
@@ -340,7 +340,7 @@ def generate_output(type, db):
                if type == 'bnos':
                        ax.plot(dat['x'], dat['y'], color(idx, 'marker'),
                                markersize=1)
-               elif dat['ax'] == None:
+               elif dat['ax'] is None:
                        continue        # Don't add legend
                else:
                        ax.plot(dat['ax'], dat['ay'], color(idx, 'line'),