python - Is it more pythonic to manipulate object I/O with @property vs override __getitem__? -

-

given dictionary of data (could come database entry), more correct way wrap dictionary's data in encapsulating class has control on data can set , returned as?

specifically, 2 ways have in mind to:

  1. override dict inherited class' __getitem__ , __setitem__ methods
  2. within standard object inherited class, add @property decorator each data entry needs controlled.

for example:

class smartcontainer(dict):      ## format/check items returned     def __getitem__(self,key):         if key == "birthday":             return "happy birthday!{bdate}".format(bdate=self.get('birthday'))         if key not in self.keys():             return 0      def __init__(self,basedict):         super(smartcontainer,self).__init__(basedict)  class smartcontainer2(object):     @property     def birthday(self):         return "happy birthday! {bdate}".format(bdate=self._birthday)     @birthday.setter     def birthday(self,value):         self._birthday = value      def __init__(self, basedict):         [self.__setattr__(k,v) k,v in basedict.iteritems()]

in purely arbitrary example, have 2 classes implement each architecture. 

smartcontainer=smartcontainer({"pi":3.14, "birthday":"01/01/2016"}) smartcontainer['birthday']  >>>'happy birthday! 01/01/2016'  smartcontainer2=smartcontainer2({"pi":3.14, "birthday":"01/01/2016"}) smartcontainer2.birthday  >>>'happy birthday! 01/01/2016'

both methods work, , seems me @property decorator more used such actions. dynamic nature of smartcontainer class' access abilities seem more straightforward me. aka smartcontainer[dynamic_key] vs smartcontainer2.__getattr__(dynamic_key).

i wondering if there reason use 1 method on other, , potential pitfalls exist?


Comments

Post a Comment

Popular posts from this blog

ruby - Trying to change last to "x"s to 23 -

-
i have been playing around irb , have string looks this: irb(main):072:0> puts ["[\"4354 5432 5432 xxxxx\", \"6547 6547 8543 xxxxx\", \"2344 6543 6674 xxxxx\", \"2346 6236 7543 xxxxx\", \"1273 5585 5587 xxxxx\"]"] => nil irb(main):073:0> what want gsub last 2 "x" s of each 17 digit combination, 23 . what i've tried far (i've been using rubular): a.gsub(/\d[x]/,"23") <= grabs "x" s i'm close a.gsub(/\w[x{2}]/,"23") <= grabs "x" s grabs two digits each combination. is there easier way i'm not understanding? a.gsub(/\d{4} \d{4} \d{4} xxx\kxx/, '23') \d{4} = 4 digits what \k drop matched far. can use don't replace entire number, still able validate have in desired format.
Read more

jquery - Clone last and append item to closest class -

-
this bare-bones code on page: <div class="list-container"> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> </div> <p><button class="add-list-item">add</button></p> <div class="list-container"> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> <div class="single-list-item"> <button>remove</button> </div> </div> <p><button class="add-list-item">add</button></p> <di
Read more

c - Unrecognised emulation mode: elf_i386 on MinGW32 -

-
i'm trying make kernel, , cannot link c output assembly. ld . i'm getting error: unrecognized emulation mode: elf_i386 i'm using windows 10 professional mingw32 , msys. code using: link.ld /* * link.ld */ output_format(elf32-i386) entry(start) sections { . = 0x100000; .text : { *(.text) } .data : { *(.data) } .bss : { *(.bss) } } kernel.c /* * kernel.c */ void kmain(void) { const char *str = "my first kernel"; char *vidptr = (char*)0xb8000; //video mem begins here. unsigned int = 0; unsigned int j = 0; /* loops clears screen * there 25 lines each of 80 columns; each element takes 2 bytes */ while(j < 80 * 25 * 2) { /* blank character */ vidptr[j] = ' '; /* attribute-byte - light grey on black screen */ vidptr[j+1] = 0x07; j = j + 2; } j = 0; /* loop writes string video memory */ while(str[j] != '\0') { /
Read more