CODEWITHSUNDEEP
phppythonarrays
gadss
gadss

Reputation: 22489

array in php and dict in python are the same?

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?

Upvotes: 8

Views: 6266

Answers (3)

WordPy PHP Cython Module
WordPy PHP Cython Module

Reputation: 11

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.

Upvotes: 0

James
James

Reputation: 1678

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.

Upvotes: 0

Raymond Hettinger
Raymond Hettinger

Reputation: 226346

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']

Upvotes: 12

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