Merge pull request #4467 from s-spindler/patch-2

[python/en-us] add sets to empty things that are false

python.html.markdown

@@ -153,13 +153,14 @@ None  # => None
 "etc" is None  # => False
 None is None   # => True
 
-# None, 0, and empty strings/lists/dicts/tuples all evaluate to False.
+# None, 0, and empty strings/lists/dicts/tuples/sets all evaluate to False.
 # All other values are True
 bool(0)     # => False
 bool("")    # => False
 bool([])    # => False
 bool({})    # => False
 bool(())    # => False
+bool(set()) # => False
 
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 ## 2. Variables and Collections