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-rw-r--r--python3.html.markdown41
1 files changed, 36 insertions, 5 deletions
diff --git a/python3.html.markdown b/python3.html.markdown
index 617a4fb6..38758078 100644
--- a/python3.html.markdown
+++ b/python3.html.markdown
@@ -463,7 +463,7 @@ with open("myfile.txt") as f:
filled_dict = {"one": 1, "two": 2, "three": 3}
our_iterable = filled_dict.keys()
-print(our_iterable) # => range(1,10). This is an object that implements our Iterable interface
+print(our_iterable) # => dict_keys(['one', 'two', 'three']). This is an object that implements our Iterable interface.
# We can loop over it.
for i in our_iterable:
@@ -552,19 +552,19 @@ x, y = swap(x, y) # => x = 2, y = 1
# Function Scope
x = 5
-def setX(num):
+def set_x(num):
# Local var x not the same as global variable x
x = num # => 43
print (x) # => 43
-def setGlobalX(num):
+def set_global_x(num):
global x
print (x) # => 5
x = num # global var x is now set to 6
print (x) # => 6
-setX(43)
-setGlobalX(6)
+set_x(43)
+set_global_x(6)
# Python has first class functions
@@ -613,6 +613,9 @@ class Human:
# Assign the argument to the instance's name attribute
self.name = name
+ # Initialize property
+ self.age = 0
+
# An instance method. All methods take "self" as the first argument
def say(self, msg):
return "{name}: {message}".format(name=self.name, message=msg)
@@ -628,6 +631,23 @@ class Human:
def grunt():
return "*grunt*"
+ # A property is just like a getter.
+ # It turns the method age() into an read-only attribute
+ # of the same name.
+ @property
+ def age(self):
+ return self._age
+
+ # This allows the property to be set
+ @age.setter
+ def age(self, age):
+ self._age = age
+
+ # This allows the property to be deleted
+ @age.deleter
+ def age(self):
+ del self._age
+
# Instantiate a class
i = Human(name="Ian")
@@ -647,6 +667,17 @@ j.get_species() # => "H. neanderthalensis"
# Call the static method
Human.grunt() # => "*grunt*"
+# Update the property
+i.age = 42
+
+# Get the property
+i.age # => 42
+
+# Delete the property
+del i.age
+i.age # => raises an AttributeError
+
+
####################################################
## 6. Modules