diff options
Diffstat (limited to 'python3.html.markdown')
| -rw-r--r-- | python3.html.markdown | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/python3.html.markdown b/python3.html.markdown index 778076f8..bc0c05bd 100644 --- a/python3.html.markdown +++ b/python3.html.markdown @@ -2,6 +2,7 @@ language: python3 contributors: - ["Louie Dinh", "http://pythonpracticeprojects.com"] + - ["Steven Basart", "http://github.com/xksteven"] filename: learnpython3.py --- @@ -37,9 +38,16 @@ Note: This article applies to Python 3 specifically. Check out the other tutoria # Except division which returns floats by default 35 / 5 # => 7.0 +# Truncation or Integer division +5 // 3 # => 1 +5.0 // 3.0 # => 1.0 + # When you use a float, results are floats 3 * 2.0 # => 6.0 +# Modulo operation +7 % 3 # => 1 + # Enforce precedence with parentheses (1 + 3) * 2 # => 8 @@ -90,6 +98,10 @@ not False # => True # You can use keywords if you don't want to count. "{name} wants to eat {food}".format(name="Bob", food="lasagna") #=> "Bob wants to eat lasagna" +# If your Python 3 code also needs to run on Python 2.5 and below, you can also +# still use the old style of formatting: +"%s can be %s the %s way" % ("strings", "interpolated", "old") + # None is an object None # => None @@ -284,7 +296,7 @@ prints: mouse is a mammal """ for animal in ["dog", "cat", "mouse"]: - # You can use % to interpolate formatted strings + # You can use format() to interpolate formatted strings print("{} is a mammal".format(animal)) """ @@ -406,6 +418,24 @@ all_the_args(**kwargs) # equivalent to foo(a=3, b=4) all_the_args(*args, **kwargs) # equivalent to foo(1, 2, 3, 4, a=3, b=4) +# Function Scope +x = 5 + +def setX(num): + # Local var x not the same as global variable x + x = num # => 43 + print (x) # => 43 + +def setGlobalX(num): + global x + print (x) # => 5 + x = num # global var x is now set to 6 + print (x) # => 6 + +setX(43) +setGlobalX(6) + + # Python has first class functions def create_adder(x): def adder(y): @@ -445,7 +475,7 @@ class Human(object): # An instance method. All methods take "self" as the first argument def say(self, msg): - return "{name}: {message}" % (name=self.name, message=msg) + return "{name}: {message}".format(name=self.name, message=msg) # A class method is shared among all instances # They are called with the calling class as the first argument |