Fix pylint errors

Framework/PythonInterface/plugins/algorithms/LRDirectBeamSort.py

 #pylint: disable=no-init,invalid-name
-import math
-import time
-import numpy as np
 import mantid
 from mantid.api import *
 from mantid.simpleapi import *
 from mantid.kernel import *
-import logging
 
 class CompareTwoNXSDataForSFcalculator(object):
     """
-        will return -1, 0 or 1 according to the position of the nexusToPosition in relation to the 
+        will return -1, 0 or 1 according to the position of the nexusToPosition in relation to the
         nexusToCompareWith based on the following criteria
         #1: number of attenuators (ascending order)
         #2: lambda requested (descending order)
@@ -58,9 +54,9 @@ class CompareTwoNXSDataForSFcalculator(object):
             resultLessThan = 1
             resultMoreThan = -1
 
-        if (_paramNexusToPosition < _paramNexusToCompareWith):
+        if _paramNexusToPosition < _paramNexusToCompareWith:
             return resultLessThan
-        elif (_paramNexusToPosition > _paramNexusToCompareWith):
+        elif _paramNexusToPosition > _paramNexusToCompareWith:
             return resultMoreThan
         else:
             return 0
@@ -74,7 +70,7 @@ def sorter_function(r1, r2):
     """
     return CompareTwoNXSDataForSFcalculator(r2, r1).result()
 
-     
+
 class LRDirectBeamSort(PythonAlgorithm):
 
     def category(self):
@@ -140,7 +136,7 @@ class LRDirectBeamSort(PythonAlgorithm):
 
     def _compute_scaling_factors(self, lr_data_sorted):
         """
-            If we need to compute the scaling factors, group the runs by their wavelength request 
+            If we need to compute the scaling factors, group the runs by their wavelength request
             @param lr_data_sorted: ordered list of workspaces
         """
         group_list = []
@@ -155,7 +151,7 @@ class LRDirectBeamSort(PythonAlgorithm):
                 if len(current_group)>0:
                     group_list.append(current_group)
                 current_group = []
-    
+
             current_group.append(r)
 
         # Add in the last group
@@ -169,7 +165,6 @@ class LRDirectBeamSort(PythonAlgorithm):
         for g in group_list:
             if len(g) == 0:
                 continue
-            runs = [r.getRunNumber() for r in g]
 
             direct_beam_runs = []
             peak_ranges = []