To understand: From PHP Array to Python?

arrays, loops, php, python

Solution

All of these are quite obvious really. I'm only listing the Pythonic ways to do these things. Update: Examples should now work in both Python 2 and Python 3. In Python 2 you could substitute xrange() for range() and iteritems() for items() for efficiency.

Example 1

PHP

$php = array(1,2,3,4,5,6,7,8,9,10);
for ($i = 0; $i < 10 ; $i ++)
echo $php[$i]."<br>";

Python (generally you iterate over lists in Python, instead of accessing by index):

lst = [1,2,3,4,5,6,7,8,9,10]
for item in lst:
    print(str(item) + "<br>")

Example 2

for ($i = 0; $i < 10 ; $i ++)
echo $php[$i] = $i +1 ;

Python:

lst = range(1, 11)
for item in lst:
    print(item)

Or maybe:

lst = []
for i in range(10):
    lst.append(i + 1)
    print(lst[-1])     # prints out last element

Example 3

$php = array(1,2,3,4,5,6,7,8,9,10);
foreach ($php as $value)
echo $value."<br>";

Same as 1st

Example 4

$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}

Python:

lst = [1, 2, 3, 4]
lst = [val * 2 for val in lst]

Example 5

$arr = array("mot"=>"one", "hai"=>"two","ba"=> "three");
foreach ($arr as $key => $value) {
    echo "Key: $key; Value: $value<br />\n";
}

Python (note that `{...}` creates a dict [dictionary] in Python, not a list/):

dct = {'mot': 'one', 'hai': 'two', 'ba': 'three'}
for key, value in dct.items():
    print("Key: %s; Value: %s<br />" % (key, value))

Example 6

$arr = array("one", "two","three");
while (list($key, $value) = each($arr)) {
    echo "Key: $key; Value: $value<br />\n";
}

Python:

lst = ['one', 'two', 'three']
for key, value in enumerate(lst):
    print("Key: %d; Value: %s<br />" % (key, value))

Example 7

$arr = array("one", "two","three");
while ($element = each($arr)) {
    echo "Key: $element['key']; Value: $element['value']<br />\n";
}

There is no direct Python equivalent to this.

Example 8

$products = array( array("ITL","INTEL","HARD"),
                        array("MIR", "MICROSOFT","SOFT"),
                        array("Py4C", "pythonkhmer.wordpress.com","TUTORIAL")
                         );
for ($row = 0; $row < 3; $row++)
{
    for ($col = 0; $col <3; $col++)
    {
        echo "|".$products[$row][$col];
    }
    echo "<br>";
}

Python:

products = [['ITL', 'INTEL', 'HARD'],
    ['MIR', 'MICROSOFT', 'SOFT'],
    ['Py4C', 'pythonkhmer.wordpress.com', 'TUTORIAL']]

for product in products:
    for item in product:
        print('|' + item)
    print('<br>')

Or maybe a more Pythonic version:

for product in products:
    print('|%s<br>' % ('|'.join(product)))

Problem

Original source