[SPARK-2470] PEP8 fixes to statcounter.py

Author: nchammas

python/pyspark/statcounter.py

@@ -20,18 +20,19 @@
 import copy
 import math
 
+
 class StatCounter(object):
-    
+
     def __init__(self, values=[]):
         self.n = 0L    # Running count of our values
         self.mu = 0.0  # Running mean of our values
         self.m2 = 0.0  # Running variance numerator (sum of (x - mean)^2)
         self.maxValue = float("-inf")
         self.minValue = float("inf")
-        
+
         for v in values:
             self.merge(v)
-            
+
     # Add a value into this StatCounter, updating the internal statistics.
     def merge(self, value):
         delta = value - self.mu
@@ -42,15 +43,15 @@ def merge(self, value):
             self.maxValue = value
         if self.minValue > value:
             self.minValue = value
-            
+
         return self
 
     # Merge another StatCounter into this one, adding up the internal statistics.
     def mergeStats(self, other):
         if not isinstance(other, StatCounter):
             raise Exception("Can only merge Statcounters!")
 
-        if other is self: # reference equality holds
+        if other is self:  # reference equality holds
             self.merge(copy.deepcopy(other))  # Avoid overwriting fields in a weird order
         else:
             if self.n == 0:
@@ -59,19 +60,19 @@ def mergeStats(self, other):
                 self.n = other.n
                 self.maxValue = other.maxValue
                 self.minValue = other.minValue
-                
-            elif other.n != 0:        
+
+            elif other.n != 0:
                 delta = other.mu - self.mu
                 if other.n * 10 < self.n:
                     self.mu = self.mu + (delta * other.n) / (self.n + other.n)
                 elif self.n * 10 < other.n:
                     self.mu = other.mu - (delta * self.n) / (self.n + other.n)
                 else:
                     self.mu = (self.mu * self.n + other.mu * other.n) / (self.n + other.n)
-                
+
                     self.maxValue = max(self.maxValue, other.maxValue)
                     self.minValue = min(self.minValue, other.minValue)
-        
+
                 self.m2 += other.m2 + (delta * delta * self.n * other.n) / (self.n + other.n)
                 self.n += other.n
         return self
@@ -94,7 +95,7 @@ def min(self):
 
     def max(self):
         return self.maxValue
-    
+
     # Return the variance of the values.
     def variance(self):
         if self.n == 0:
@@ -124,5 +125,5 @@ def sampleStdev(self):
         return math.sqrt(self.sampleVariance())
 
     def __repr__(self):
-        return "(count: %s, mean: %s, stdev: %s, max: %s, min: %s)" % (self.count(), self.mean(), self.stdev(), self.max(), self.min())
-
+        return "(count: %s, mean: %s, stdev: %s, max: %s, min: %s)" %
+        (self.count(), self.mean(), self.stdev(), self.max(), self.min())