Switching from statistics to numpy

haralyzer/assets.py

@@ -7,9 +7,9 @@
 import dateutil
 # I know this import is stupid, but I cannot use dateutil.parser without it
 from dateutil import parser
+import numpy
 assert parser
 import re
-import statistics
 
 from haralyzer.compat import iteritems
 
@@ -214,7 +214,8 @@ def get_stdev(self, asset_type):
         else:
             load_times = self.get_load_times(asset_type)
 
-        return round(statistics.stdev(load_times), self.decimal_precision)
+        return round(numpy.std(load_times, ddof=1),
+                     self.decimal_precision)
 
     @property
     def pages(self):
@@ -247,15 +248,15 @@ def time_to_first_byte(self):
         ttfb = []
         for page in self.pages:
             ttfb.append(page.time_to_first_byte)
-        return round(statistics.mean(ttfb), self.decimal_precision)
+        return round(numpy.mean(ttfb), self.decimal_precision)
 
     @cached_property
     def page_load_time(self):
         """
         The average total load time for all runs (not weighted).
         """
         load_times = self.get_load_times('page')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
     @cached_property
     def js_load_time(self):
@@ -266,47 +267,47 @@ def js_load_time(self):
         total load time or the browser load time
         """
         load_times = self.get_load_times('js')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
     @cached_property
     def css_load_time(self):
         """
         Returns aggregate css load time for all pages.
         """
         load_times = self.get_load_times('css')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
     @cached_property
     def image_load_time(self):
         """
         Returns aggregate image load time for all pages.
         """
         load_times = self.get_load_times('image')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
     @cached_property
     def html_load_time(self):
         """
         Returns aggregate html load time for all pages.
         """
         load_times = self.get_load_times('html')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
     @cached_property
     def audio_load_time(self):
         """
         Returns aggregate audio load time for all pages.
         """
         load_times = self.get_load_times('audio')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
     @cached_property
     def video_load_time(self):
         """
         Returns aggregate video load time for all pages.
         """
         load_times = self.get_load_times('video')
-        return round(statistics.mean(load_times), self.decimal_precision)
+        return round(numpy.mean(load_times), self.decimal_precision)
 
 
 class HarPage(object):

requirements.txt

@@ -1,5 +1,5 @@
-statistics; python_version <= '2.7'
+cached-property
+numpy
 python-dateutil
 pytest-cov
 python-coveralls
-cached-property

setup.py

@@ -7,8 +7,8 @@
 
 
 install_reqs = ['cached-property',
-                'python-dateutil',
-                'statistics', ]
+                'numpy',
+                'python-dateutil', ]
 
 readme = open('README.rst').read()