From 375f0c18ae9b8d8732c480d0647becf1e82adf3e Mon Sep 17 00:00:00 2001 From: evuez Date: Wed, 14 Oct 2015 18:43:23 +0200 Subject: Add some stuff to lists, sets and classes This is meant to match Python 3 update. Lists: added remove, insert and index Sets: added ^, <=, >= operators Classes: added propery decorator (including getter, setter, deleter) --- python.html.markdown | 60 ++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 56 insertions(+), 4 deletions(-) (limited to 'python.html.markdown') 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 -- cgit v1.2.3 From a9bcaffd36dc3d3bfa6ec50f1861c9d006631d0b Mon Sep 17 00:00:00 2001 From: viv1 Date: Fri, 16 Oct 2015 12:57:31 +0530 Subject: [python/en]...Added some info on division --- python.html.markdown | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'python.html.markdown') diff --git a/python.html.markdown b/python.html.markdown index b939ebbe..3d8f0085 100644 --- a/python.html.markdown +++ b/python.html.markdown @@ -58,6 +58,12 @@ allow you to write Python 3 code that will run on Python 2, so check out the Pyt -5 // 3 # => -2 -5.0 // 3.0 # => -2.0 +# Note that we can also import division module(Section 6 Modules) +# to carry out normal division with just one '/'. +from __future__ import division +11/4 # => 2.75 ...normal division +11//4 # => 2 ...floored division + # Modulo operation 7 % 3 # => 1 -- cgit v1.2.3 From 451ccaec5b489f0144cf3d537c0debb73ebd3c82 Mon Sep 17 00:00:00 2001 From: Ankit Aggarwal Date: Fri, 16 Oct 2015 20:42:03 +0530 Subject: Adding documentation on ternary operator --- python.html.markdown | 1 + 1 file changed, 1 insertion(+) (limited to 'python.html.markdown') diff --git a/python.html.markdown b/python.html.markdown index b939ebbe..daaeb70c 100644 --- a/python.html.markdown +++ b/python.html.markdown @@ -165,6 +165,7 @@ some_var # => 5 some_other_var # Raises a name error # if can be used as an expression +# Equivalent of C's '?:' ternary operator "yahoo!" if 3 > 2 else 2 # => "yahoo!" # Lists store sequences -- cgit v1.2.3 From c60ddc6ef5d80cc87b051b848ccce0b7f335f5f1 Mon Sep 17 00:00:00 2001 From: MDS Date: Tue, 20 Oct 2015 01:01:14 +1300 Subject: Updated official python docs to always use the latest version of python 2 --- python.html.markdown | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'python.html.markdown') diff --git a/python.html.markdown b/python.html.markdown index 675967f4..42a52bcf 100644 --- a/python.html.markdown +++ b/python.html.markdown @@ -707,7 +707,7 @@ print say(say_please=True) # Can you buy me a beer? Please! I am poor :( * [Automate the Boring Stuff with Python](https://automatetheboringstuff.com) * [Learn Python The Hard Way](http://learnpythonthehardway.org/book/) * [Dive Into Python](http://www.diveintopython.net/) -* [The Official Docs](http://docs.python.org/2.6/) +* [The Official Docs](http://docs.python.org/2/) * [Hitchhiker's Guide to Python](http://docs.python-guide.org/en/latest/) * [Python Module of the Week](http://pymotw.com/2/) * [A Crash Course in Python for Scientists](http://nbviewer.ipython.org/5920182) -- cgit v1.2.3