Gideon Israel Dsouza gideondsouza

## dancer_webservice.pl
package MyWebService;

use Dancer;
use Dancer::Plugin::REST;
#this line kicks in the plugin. So now whatever you return will be formatted and send back
prepare_serializer_for_format;
#this sets up a route that takes an id a dot and an extension
get '/user/:id.:format' => sub {
    User->find(params->{id});#return some reference to a hash or array or what have you
};

## lwp_psgi_dance2.pl
use LWP::UserAgent;
use LWP::Protocol::PSGI;

# can be Mojolicious, Catalyst ... any PSGI application
my $psgi_app = do {
    use Dancer;#ATTENTION: changing this to Dancer2 makes this sample NOT WORK.
    setting apphandler => 'PSGI';
    get '/search' => sub {
        return 'googling ' . params->{q};
    };

## intro_tuple.py
>>> #The tuple is a common CS structure.
>>> T = (1,2,3) #think of it as a record
>>> type(T)
<class 'tuple'>
#you're not limited to numbers, you can store anything in a tuple, list, set etc.
>>> Friends = ("Bill", "Bob", "Will")
>>> Friends[0] #access it's first element.
'Bill'
>>> T[2]
3

## intro_set.py
>>>
>>> S = {1,3} #a new set with two elements
>>> type(S) #what is the type of S?
<class 'set'>
>>> S1 = {3,4,5} #initialize two sets S1 and S2
>>> S2 = {3,6,7}
>>> S1 | S2 #this will give you a union of the two.
{3, 4, 5, 6, 7}
>>> #you can also use & for intersection, and ^ for xor

## python_comprehensions1.py
C:\Gideon\Coding>python
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AM
D64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> L1 = [1,2,3] #this is how you define a plain list
>>> L1 #type the variable and...
[1, 2, 3] #....this is what it's content looks like
>>> L2 = [x for x in range(20)]  #now shove a for into a list and you have a dynamic list
>>> L2
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]

## python_comprehensions3.py
>>>
>>> L = [1,2,3,4,5] #define a list 1 to 5
>>> [(x,y) for x in L for y in L] # we have two fors running over the list
#this gives all the 25 non-unique combinations
[(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5),
 (3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5),
 (5, 1), (5, 2), (5, 3), (5, 4), (5, 5)]
#need unque combinations. No problem! Add an if in the end.
>>> [(x,y) for x in L for y in L if x!=y]
[(1, 2), (1, 3), (1, 4), (1, 5), (2, 1), (2, 3), (2, 4), (2, 5), (3, 1), (3, 2),

## python_comprehensions2.py
>>> L4 = [x*x for x in range(10)] #this will evaluate to a list of squares from 1 to 10
>>> L4
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
>>> #the next comprehension will evaluate to a list of even numbers from 1 to 20
>>> L3 = [x for x in range(20) if x % 2 == 0]
>>> L3
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
>>>

## login_test.pl
use Dancer2;
use strict;
use warnings;

set session => "Simple";

hook before => sub {
    if (!session('user') && request->dispatch_path !~ m{^/login}) {
        forward '/login', { requested_path => request->dispatch_path };
    }

## login.tt
<html>
<head>
  <title>Session and log</title>
</head>
<body>
	<form action='/login' method='POST'>
		User Name : <input type='text' name='user'/>
		Password: <input type='password' name='pass' />
		<input type='hidden' name='path' value='[% path %]'/>
		<input type='submit' value='Login' />

## session_test.pl
 1 use Dancer2;
  2 use strict;
  3 use warnings;
  4
  5 set session => 'Simple';
  6
  7 get '/store' => sub {
  8         session foo  => 'Something';
  9         return "Stored";
 10 };
	package MyWebService;

	use Dancer;
	use Dancer::Plugin::REST;
	#this line kicks in the plugin. So now whatever you return will be formatted and send back
	prepare_serializer_for_format;
	#this sets up a route that takes an id a dot and an extension
	get '/user/:id.:format' => sub {
	User->find(params->{id});#return some reference to a hash or array or what have you
	};
	use LWP::UserAgent;
	use LWP::Protocol::PSGI;

	# can be Mojolicious, Catalyst ... any PSGI application
	my $psgi_app = do {
	use Dancer;#ATTENTION: changing this to Dancer2 makes this sample NOT WORK.
	setting apphandler => 'PSGI';
	get '/search' => sub {
	return 'googling ' . params->{q};
	};
	>>> #The tuple is a common CS structure.
	>>> T = (1,2,3) #think of it as a record
	>>> type(T)
	<class 'tuple'>
	#you're not limited to numbers, you can store anything in a tuple, list, set etc.
	>>> Friends = ("Bill", "Bob", "Will")
	>>> Friends[0] #access it's first element.
	'Bill'
	>>> T[2]
	3
	>>>
	>>> S = {1,3} #a new set with two elements
	>>> type(S) #what is the type of S?
	<class 'set'>
	>>> S1 = {3,4,5} #initialize two sets S1 and S2
	>>> S2 = {3,6,7}
	>>> S1 \| S2 #this will give you a union of the two.
	{3, 4, 5, 6, 7}
	>>> #you can also use & for intersection, and ^ for xor
	C:\Gideon\Coding>python
	Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:06:53) [MSC v.1600 64 bit (AM
	D64)] on win32
	Type "help", "copyright", "credits" or "license" for more information.
	>>> L1 = [1,2,3] #this is how you define a plain list
	>>> L1 #type the variable and...
	[1, 2, 3] #....this is what it's content looks like
	>>> L2 = [x for x in range(20)] #now shove a for into a list and you have a dynamic list
	>>> L2
	[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
	>>>
	>>> L = [1,2,3,4,5] #define a list 1 to 5
	>>> [(x,y) for x in L for y in L] # we have two fors running over the list
	#this gives all the 25 non-unique combinations
	[(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5),
	(3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5),
	(5, 1), (5, 2), (5, 3), (5, 4), (5, 5)]
	#need unque combinations. No problem! Add an if in the end.
	>>> [(x,y) for x in L for y in L if x!=y]
	[(1, 2), (1, 3), (1, 4), (1, 5), (2, 1), (2, 3), (2, 4), (2, 5), (3, 1), (3, 2),
	>>> L4 = [x*x for x in range(10)] #this will evaluate to a list of squares from 1 to 10
	>>> L4
	[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
	>>> #the next comprehension will evaluate to a list of even numbers from 1 to 20
	>>> L3 = [x for x in range(20) if x % 2 == 0]
	>>> L3
	[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
	>>>
	use Dancer2;
	use strict;
	use warnings;

	set session => "Simple";

	hook before => sub {
	if (!session('user') && request->dispatch_path !~ m{^/login}) {
	forward '/login', { requested_path => request->dispatch_path };
	}
	<html>
	<head>
	<title>Session and log</title>
	</head>
	<body>
	<form action='/login' method='POST'>
	User Name : <input type='text' name='user'/>
	Password: <input type='password' name='pass' />
	<input type='hidden' name='path' value='[% path %]'/>
	<input type='submit' value='Login' />
	1 use Dancer2;
	2 use strict;
	3 use warnings;
	4
	5 set session => 'Simple';
	6
	7 get '/store' => sub {
	8 session foo => 'Something';
	9 return "Stored";
	10 };