php - php python中的二维数组插入等效

Question

我在 PHP 方面的经验很少，我必须将 php 脚本转换为 python。我无法理解这些行在代码中到底做了什么：

$vars = array();
$vars['a'] = array();
$vars['b'] = array();
$vars['b'][] =  'text1';

最后一行代表什么？如果我将下面的行添加到代码中会发生什么？

$vars['b'][] =  'text2';

我也将不胜感激将其转换为 python 的帮助。非常感谢，

Answer 1

如果您想将 PHP 代码片段转换为 python，您可以获得的最接近的代码片段会是

>>> var = {}
>>> var['a'] = {}
>>> var['b'] = {}
>>> var['b'][len(var['b'] )] = 'text1'
>>> var['b'][len(var['b'] )] = 'text2'
>>> var
{'a': {}, 'b': {0: 'text1', 1: 'text2'}}

另一种变化

>>> class array(dict):
    def __getitem__(self, key):
        return dict.__getitem__(self, key)
    def __setitem__(self, key, value):
        if key == slice(None, None, None):
            dict.__setitem__(self, self.__len__(), value)
        else:
            dict.__setitem__(self, key, value)


>>> var = array()
>>> var['a'] = array()
>>> var['b'] = array()
>>> var['b'][:] = 'text1'
>>> var['b'][:] = 'text2'
>>> var
{'a': {}, 'b': {0: 'text1', 1: 'text2'}}

Answer 2

最后一行只是将text带有数字（递增）键的字符串添加到数组$vars['b']中。

为空时$vars['b']，以键 0 开头。 (=> $vars['b'][0] === 'text')

---

这意味着您的数组将如下所示：

array(2) {
  ["a"]=>
  array(0) {
  }
  ["b"]=>
  array(2) {
    [0]=>
    string(5) "text1"
    [1]=>
    string(5) "text2"
  }
}

（对不起；在你问这个问题的时候，没有最后一句话，我也希望能帮助我把它转换成 python。但是……我不知道 python。）

Answer 3

// http://www.trainweb.org/mccloudrails/History/boxcars_runaround.jpg![a train with box cars][1]
// imagine this like a train, and each boxcar on that train has a name on it
// this is like a list in python @see http://www.tutorialspoint.com/python/python_lists.htm
$vars = array();

// this is the name of the first box car, now this box car is ALSO a train with box cars, ie, a train within a boxcar of a train
$vars['a'] = array();

// same as above, but with a different box car 
$vars['b'] = array();

// @see http://stackoverflow.com/questions/252703/python-append-vs-extend
$vars['b'][] =  'text1';

// Q) what  does the last line stand for? And what would happen if I add the line below to the code? $vars['b'][] =  'text2';
// A) This would make the array look somewhat like this: 
//    [a => [/* empty sad box car in an empty sad box car */]] [b => ['text1', 'text2'] ]

这并不完全准确，但却是一个很好的开始。 http://www.youtube.com/watch?v=ufmzc2sDmhs