Add --ib option to use binary prefixes

This is mainly for use with the --bytes options since many file managers and applications assume use of 1024 intead of 1000 when it comes to dealing with data sizes in bytes. This is so users can get a closer to realistic view for general data (pretty much except those on OS X and possibly Ubuntu, whose file manager(s) use SI units).

Please see http://en.wikipedia.org/wiki/Binary_prefix

README.md

@@ -24,4 +24,6 @@ speedtest-cli-3 is written for use with Python 3
       --simple         Suppress verbose output, only show basic information
       --list           Display a list of speedtest.net servers sorted by distance
       --bytes          Display speeds in MBytes/s (instead of Mbit/s)
+      --ib             Use IEC binary prefixes (MiB, etc)
+                       http://en.wikipedia.org/wiki/Binary_prefix
       --server SERVER  Specify a server ID to test against

speedtest-cli

@@ -291,6 +291,7 @@ def speedtest():
                              'sorted by distance')
     parser.add_argument('--server', help='Specify a server ID to test against')
     parser.add_argument('--bytes', action='store_true', help='Show speed in MB per second')
+    parser.add_argument('--ib', action='store_true', help='Use IEC binary prefixes (MiB, etc)')
 
     options = parser.parse_args()
     if isinstance(options, tuple):
@@ -343,8 +344,13 @@ def speedtest():
         print 'Ping: %(latency)s ms' % best
 
     unit = 'bits'
+    size_divisor = 1000
+
     if args.bytes:
         unit = 'B'
+    if args.ib:
+        unit = 'i' + unit
+        size_divisor = 1024
 
     sizes = [350, 500, 750, 1000, 1500, 2000, 2500, 3000, 3500, 4000]
     urls = []
@@ -358,12 +364,12 @@ def speedtest():
     if not args.simple:
         print
 
-    dlspeed = dlspeed / 1000 / 1000
+    dlspeed = dlspeed / size_divisor / size_divisor
     if not args.bytes:
         dlspeed = dlspeed * 8
     print 'Download: %0.2f M%s/s' % (dlspeed, unit)
 
-    sizesizes = [int(.25 * 1000 * 1000), int(.5 * 1000 * 1000)]
+    sizesizes = [int(.25 * size_divisor * size_divisor), int(.5 * size_divisor * size_divisor)]
     sizes = []
     for size in sizesizes:
         for i in xrange(0, 25):
@@ -374,11 +380,12 @@ def speedtest():
     if not args.simple:
         print
 
-    ulspeed = ulspeed / 1000 / 1000
+    ulspeed = ulspeed / size_divisor / size_divisor
     if not args.bytes:
         ulspeed = ulspeed * 8
     print 'Upload: %0.2f M%s/s' % (ulspeed, unit)
 
+    # --ib option does not affect this part
     if args.share:
         dlspeedk = int(round((dlspeed / 1000) * 8, 0))
         ping = int(round(best['latency'], 0))

speedtest-cli-3

@@ -273,6 +273,7 @@ def speedtest():
                              'sorted by distance')
     parser.add_argument('--server', help='Specify a server ID to test against')
     parser.add_argument('--bytes', action='store_true', help='Show speed in MB per second')
+    parser.add_argument('--ib', action='store_true', help='Use IEC binary prefixes (MiB, etc)')
     args = parser.parse_args()
 
     if not args.simple:
@@ -320,8 +321,13 @@ def speedtest():
         print('Ping: %(latency)s ms' % best)
 
     unit = 'bits'
+    size_divisor = 1000
+
     if args.bytes:
         unit = 'B'
+    if args.ib:
+        unit = 'i' + unit
+        size_divisor = 1024
 
     sizes = [350, 500, 750, 1000, 1500, 2000, 2500, 3000, 3500, 4000]
     urls = []
@@ -335,12 +341,12 @@ def speedtest():
     if not args.simple:
         print()
 
-    dlspeed = dlspeed / 1000 / 1000
+    dlspeed = dlspeed / size_divisor / size_divisor
     if not args.bytes:
         dlspeed = dlspeed * 8
     print('Download: %0.2f M%s/s' % (dlspeed, unit))
 
-    sizesizes = [int(.25 * 1000 * 1000), int(.5 * 1000 * 1000)]
+    sizesizes = [int(.25 * size_divisor * size_divisor), int(.5 * size_divisor * size_divisor)]
     sizes = []
     for size in sizesizes:
         for i in range(0, 25):
@@ -351,11 +357,12 @@ def speedtest():
     if not args.simple:
         print()
 
-    ulspeed = ulspeed / 1000 / 1000
+    ulspeed = ulspeed / size_divisor / size_divisor
     if not args.bytes:
         ulspeed = ulspeed * 8
     print('Upload: %0.2f M%s/s' % (ulspeed, unit))
 
+    # --ib option does not affect this part
     if args.share:
         dlspeedk = int(round((dlspeed / 1000) * 8, 0))
         ping = int(round(best['latency'], 0))