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-rw-r--r--python.html.markdown60
1 files changed, 56 insertions, 4 deletions
diff --git a/python.html.markdown b/python.html.markdown
index 5b36083d..c66b7642 100644
--- a/python.html.markdown
+++ b/python.html.markdown
@@ -4,6 +4,7 @@ contributors:
- ["Louie Dinh", "http://ldinh.ca"]
- ["Amin Bandali", "http://aminbandali.com"]
- ["Andre Polykanine", "https://github.com/Oire"]
+ - ["evuez", "http://github.com/evuez"]
filename: learnpython.py
---
@@ -206,6 +207,17 @@ li + other_li # => [1, 2, 3, 4, 5, 6]
# Concatenate lists with "extend()"
li.extend(other_li) # Now li is [1, 2, 3, 4, 5, 6]
+# Remove first occurrence of a value
+li.remove(2) # li is now [1, 3, 4, 5, 6]
+li.remove(2) # Raises a ValueError as 2 is not in the list
+
+# Insert an element at a specific index
+li.insert(1, 2) # li is now [1, 2, 3, 4, 5, 6] again
+
+# Get the index of the first item found
+li.index(2) # => 3
+li.index(7) # Raises a ValueError as 7 is not in the list
+
# Check for existence in a list with "in"
1 in li # => True
@@ -297,6 +309,15 @@ filled_set | other_set # => {1, 2, 3, 4, 5, 6}
# Do set difference with -
{1, 2, 3, 4} - {2, 3, 5} # => {1, 4}
+# Do set symmetric difference with ^
+{1, 2, 3, 4} ^ {2, 3, 5} # => {1, 4, 5}
+
+# Check if set on the left is a superset of set on the right
+{1, 2} >= {1, 2, 3} # => False
+
+# Check if set on the left is a subset of set on the right
+{1, 2} <= {1, 2, 3} # => True
+
# Check for existence in a set with in
2 in filled_set # => True
10 in filled_set # => False
@@ -448,19 +469,19 @@ def pass_all_the_args(*args, **kwargs):
# 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
def create_adder(x):
@@ -504,6 +525,10 @@ class Human(object):
# 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 "{0}: {1}".format(self.name, msg)
@@ -519,6 +544,23 @@ class Human(object):
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")
@@ -538,6 +580,16 @@ 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