array in php and dict in python are the same?

Question

I have a project using python and i want to convert the php to python. I have confused in the array of php in converting it to python...

in the old code of the php... it looks like this,

array(
      "Code"          => 122,
      "Reference"     => 1311,
      "Type"          => 'NT',
      "Amount"        => 100.00
);

and this is what i did in converting it to python ...

dict = {
          "Code":122,
          "Reference":1311,
          "Type":'NT',
          "Amount":100.00
}

is my converting php to python is correct?

Raymond Hettinger · Accepted Answer · 2012-01-24 02:27:26Z

12

Your conversion is essentially correct (though I wouldn't use dict as a variable name since that masks a built-in class constructor of the same name). That being said, PHP arrays are ordered mappings, so you should use a Python OrderedDict instead of a regular dict so that the order of insertion gets preserved:

>>> import collections
>>> od = collections.OrderedDict([
        ('Code', 122),
        ('Reference', 1311),
        ('Type', 'NT'),
        ('Amount', 100.00),
])

>>> print od['Amount']
100.0

>>> od.keys()
['Code', 'Reference', 'Type', 'Amount']

edited Jan 24, 2012 at 2:27

answered Jan 24, 2012 at 2:16

Raymond Hettinger

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James · Accepted Answer · 2016-07-28 18:53:59Z

0

To be specific, a PHP associative array is the same as a Python dictionary, and the PHP associative array is ordered. Ruby hash tables are same as PHP associative arrays (ordered key-value pairs).

Python lists and PHP arrays are the same (unordered lists of non-keyed values). Ruby arrays are the same as Python and PHP.

answered Jul 28, 2016 at 18:53

James

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WordPy PHP Cython Module · Accepted Answer · 2017-10-06 04:23:35Z

PHP arrays are different from py objects that:

PHP keys can be integers or strings (associative),
When a value is appended to an array, a numeric key is automatically assigned before appending the key/value pair to the array. The assigned associated key has integer value that equals to the maximum of the array's internal numeric iterator index keys plus 1,
Numeric integer keys in string are casted into integers,
The order of insertion to the array is preserved. key/value pairs are iterated according to the insertion order of the keys. We can use Python's OrderedDict to emulate,
PHP array[] = 5 is translated to Python array.append(5) or array[None] = 5,
The iterator index keys are manipulated through PHP built-in functions, or are passed by reference, with a copy on write policy.

I'd like to give a plug to my newly released product pyx.php Python module. There is a Python class array in the module that emulates a PHP array. Our Python emulation of the PHP array uses an OrderedDict instance variable, where array._obj is an OrderedDic to store all elements of the array and keep track of their orders of insertion using a custom pointer instance variable. Try:

$ git clone https://github.com/wordpy/pyx/
$ python # or ipython`

>>> import pyx.php as Php; array = Php.array
>>> arr1 = array( (0,'1-0'),('a','1-a'),('b','1-b'),)
>>> arr2 = array( (0,'2-0'),(  1,'2-1'),('b','2-b'),('c','2-c'),)
>>> arr1 + arr2   # same as: Php.array_plus(arr1, arr2), see below
>>> Php.array_merge(arr1, arr2)

>>> import pyx.php as Php;  array = Php.array
>>> Arr0 = array()   # Arr0._obj is an empty OrderedDict()
>>> Arr1 = array( ('a',11), 'zzz', (99,99), 22, 33, (2,22) )
>>> Arr1
array(6) {
  ['a']=> <int> 11
  [0]=> <str> zzz
  [99]=> <int> 99
  [100]=> <int> 22
  [101]=> <int> 33
  [2]=> <int> 22
}

zip() works for array with different len !!!

>>> for i,j in zip( array(1,2,3,4), array(11,22,33) ):
...   print(i,j)
1 11
2 22
3 33
>>> for i,j in zip( array(1,2), array(11,22,33) ):
...   print(i,j)
1 11
2 22

array() in the pyx.php Cython module offers almost everything that a PHP array() offers, plus many more methods. Please see https://wordpy.com/pyx/php/.

Currently, pyx.php is only available for Python 3.x running 64-bit Linux. Python 2.x, Mac, or other platforms can be compiled when there are many requests.

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