diff options
Diffstat (limited to 'python3.html.markdown')
| -rw-r--r-- | python3.html.markdown | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/python3.html.markdown b/python3.html.markdown index 4d5bb3ae..ecdbd932 100644 --- a/python3.html.markdown +++ b/python3.html.markdown @@ -41,10 +41,10 @@ Note: This article applies to Python 3 specifically. Check out [here](http://lea 10 * 2 # => 20 35 / 5 # => 7.0 -# Result of integer division truncated down both for positive and negative. +# Integer division rounds down for both positive and negative numbers. 5 // 3 # => 1 -5.0 // 3.0 # => 1.0 # works on floats too -5 // 3 # => -2 +5.0 // 3.0 # => 1.0 # works on floats too -5.0 // 3.0 # => -2.0 # The result of division is always a float @@ -155,7 +155,7 @@ len("This is a string") # => 16 name = "Reiko" f"She said her name is {name}." # => "She said her name is Reiko" # You can basically put any Python statement inside the braces and it will be output in the string. -f"{name} is {len(name)} characters long." +f"{name} is {len(name)} characters long." # => "Reiko is 5 characters long." # None is an object @@ -314,16 +314,19 @@ valid_dict = {(1,2,3):[1,2,3]} # Values can be of any type, however. filled_dict["one"] # => 1 # Get all keys as an iterable with "keys()". We need to wrap the call in list() -# to turn it into a list. We'll talk about those later. Note - Dictionary key -# ordering is not guaranteed. Your results might not match this exactly. -list(filled_dict.keys()) # => ["three", "two", "one"] +# to turn it into a list. We'll talk about those later. Note - for Python +# versions <3.7, dictionary key ordering is not guaranteed. Your results might +# not match the example below exactly. However, as of Python 3.7, dictionary +# items maintain the order at which they are inserted into the dictionary. +list(filled_dict.keys()) # => ["three", "two", "one"] in Python <3.7 +list(filled_dict.keys()) # => ["one", "two", "three"] in Python 3.7+ # Get all values as an iterable with "values()". Once again we need to wrap it # in list() to get it out of the iterable. Note - Same as above regarding key # ordering. -list(filled_dict.values()) # => [3, 2, 1] - +list(filled_dict.values()) # => [3, 2, 1] in Python <3.7 +list(filled_dict.values()) # => [1, 2, 3] in Python 3.7+ # Check for existence of keys in a dictionary with "in" "one" in filled_dict # => True @@ -805,6 +808,7 @@ class Superhero(Human): # add additional class attributes: self.fictional = True self.movie = movie + # be aware of mutable default values, since defaults are shared self.superpowers = superpowers # The "super" function lets you access the parent class's methods |