坚持使用PHP进行Python翻译

Question

I'm attempting to translate some PHP code to Python and I'm stuck on the 4th line in the following code (included for context):

$table = array();
for ($i = 0; $i < strlen($text); $i++) {
    $char = substr($text, $i, $look_forward);
    if (!isset($table[$char])) $table[$char] = array();
}

If array() is used to create an array in PHP, what is $table[$char] = array() doing? Creating a new array inside an existing array? Or is it extending the array?

What is this accomplishing? What would be the Python equivalent to this?

if (!isset($table[$char])) $table[$char] = array();

Answer 1

its called Multidimensional Arrays, an array can hold another array . Take a look at following link http://www.w3schools.com/php/php_arrays_multi.asp