Python Tutorials

Python Part 9: For Loops

This post allows you to observe the syntax for Python and PHP for-loops using using a dictionary.

	 	 
""" 
dict.keys(), dict.values() and dict.items()

for key in single_structure_dict: #faster, but equivalent to: for key in
                                   single_structure_dict.keys()	 	 
    print(key)

http://stackoverflow.com/questions/3294889/iterating-over-dictionaries-using-for-loops-in-python
http://stackoverflow.com/questions/17793364/python-iterate-dictionary-by-index
"""

single_structure_dict = {'Store_1': 'Trader Joe\'s', \
    'Store_2': 'The Fresh Market', 'Store_3': 'Wholefoods'}

for key in single_structure_dict:
     print(key + ' is ' + single_structure_dict[key])     

for key, value in single_structure_dict.items():	 	 
    print(key + ' is ' + value)

for key in single_structure_dict:
     print(single_structure_dict[key])  
 	 

for i in range(0, 10):	 	 
    print(i)

""" 
NB: May use single or double quotes to define strings. Choose 
a convention and stick with it
""" 	 	 

	 	 
$single_structure_arr = array (	 	 
	'Store_1' => 'Trader Joe\'s', 	 	 
	'Store_2' => 'The Fresh Market',	 	 
	'Store_3' => 'Wholefoods');	 	 

foreach ( $single_structure_arr as $key=>$value ) {	 	 
	echo $key . ' is ' . $value;	 	 
}	

foreach ( $single_structure_arr as $value ) {	 	 
	echo $value;	 	 
}	

for ($i=0; $i<=9; $i++) {	 	 
	echo $i;	 	 
}

/*
* NB: Single and double quotes have differing functionalities in PHP.  
* Use single quotes to define strings. Use double quotes when 
* there's a variable in your string that must be evaluated.
*/
	 	 

/*
* Associative arrays don't exist in JS, so we traditionally use objects to 
* mimic that functionality and syntax. JS Objects may be accessed via bracket 
* or dot notation
*
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
*
* Create via: var single_structure_obj = {}
*
*/
	 	 
var single_structure_obj = {	 	 
	 Store_1 : 'Trader Joe\'s', 	 	
	 Store_2 : 'The Fresh Market',	 	 
	 Store_3 : 'Wholefoods',
};	 	 

for (var store in single_structure_obj){	 	 
	console.log(store + ' is ' + single_structure_obj[store]);
	//console.log(store, 'is', single_structure_obj[store]); 
}	

for (var i=0; i<=9; i++) {	 	 
	console.log(i);	 	 
}	

/*
* NB: May use single or double quotes to define strings. Choose 
* a convention and stick with it
*/