class-variables

问题 Alright, this is my main code: require "checkpassword.php"; require "mysqllogininfo.php"; # Validate password if (!validatePassword($_GET["password"])) { return; } # Get variables $uuid = $_GET["uuid"]; if (preg_match('/^\d+$/',$_GET["rank"]) == false) { die("Rank must be integer"); } $rank = $_GET["rank"]; # Validate UUID if ($uuid == null) { die ("Supply uuid"); } # Validate rank if ($rank == null) { die ("Supply rank"); } else if ($rank < 0 || $rank > 6) { die ("Invalid rank"); } # Load

问题 Alright, this is my main code: require "checkpassword.php"; require "mysqllogininfo.php"; # Validate password if (!validatePassword($_GET["password"])) { return; } # Get variables $uuid = $_GET["uuid"]; if (preg_match('/^\d+$/',$_GET["rank"]) == false) { die("Rank must be integer"); } $rank = $_GET["rank"]; # Validate UUID if ($uuid == null) { die ("Supply uuid"); } # Validate rank if ($rank == null) { die ("Supply rank"); } else if ($rank < 0 || $rank > 6) { die ("Invalid rank"); } # Load

问题 I am doing some basic practice for Python. Here, I am defining 3 classes. Now, I need to pass instance of first class in another class and use that in the last one. I wrote code like below: #defining first class: class MobileInventory: def __init__(self, inventory=None): if inventory == None: balance_inventory = {} elif not isinstance(inventory, dict): raise TypeError("Input inventory must be a dictionary") elif not (set(map(type, inventory)) == {str}): raise ValueError("Mobile model name

问题 class Something @@variable = 'Class variable' def give_me @@variable end end class OtherThing @variable = 'Instance variable with an interface' class << self attr_accessor :variable end def give_me self.class.variable end end p Something.new.give_me p OtherThing.new.give_me What I want to know is, which one should I use? Which are the benefits and cons of each? Class variables are: Private unless you make an interface Shared between inheritances Shorter to write Class-instance variables are:

问题 class Something @@variable = 'Class variable' def give_me @@variable end end class OtherThing @variable = 'Instance variable with an interface' class << self attr_accessor :variable end def give_me self.class.variable end end p Something.new.give_me p OtherThing.new.give_me What I want to know is, which one should I use? Which are the benefits and cons of each? Class variables are: Private unless you make an interface Shared between inheritances Shorter to write Class-instance variables are:

问题 I know it's wired to have such a case but somehow I have it: class foo #static method @staticmethod def test(): pass # class variable c = {'name' : <i want to reference test method here.>} What's the way to it? Just for the record: I believe this should be considered as python worst practices. Using static methods is not really pythoish way if ever... 回答1: class Foo: # static method @staticmethod def test(): pass # class variable c = {'name' : test } 回答2: The problem is static methods in

问题 In below example Test class has two instance method and one classmethod In set_cls_var_1 method I set class variable using self. In set_cls_var_2 method I call class method using self. class Test(): #class variable cls_var = 10 def __init__(self): obj_var=20 def set_cls_var_1(self,val): #second method to access class variable print "first " self.cls_var = val def set_cls_var_2(self): print "second" self.task(200) @classmethod def task(cls,val): cls.cls_var = val t=Test() #set class variable

问题 I tried the following code in codepad.org: class test { const TEST = 'testing 123'; function test () { $testing = 'TEST'; echo self::$testing; } } $class = new test; And it returned with: 1 2 Fatal error: Access to undeclared static property: test::$testing on line 6 I want to know whether referencing a class constant with a variable would work on my server at home which runs php 5.2.9 whereas codepad uses 5.2.5 . What are changes in class variables with each version of PHP? 回答1: The Scope

问题 This question already has answers here : Accessing class variables from a list comprehension in the class definition (5 answers) Closed 16 days ago . Given the class from __future__ import annotations from typing import ClassVar, Dict, Final import abc class Cipher(abc.ABC): @abc.abstractmethod def encrypt(self, plaintext: str) -> str: pass @abc.abstractmethod def decrypt(self, ciphertext: str) -> str: pass class VigenereCipher(Cipher): @staticmethod def rotate(n: int) -> str: return string

问题 This question already has answers here : Accessing class variables from a list comprehension in the class definition (5 answers) Closed 16 days ago . Given the class from __future__ import annotations from typing import ClassVar, Dict, Final import abc class Cipher(abc.ABC): @abc.abstractmethod def encrypt(self, plaintext: str) -> str: pass @abc.abstractmethod def decrypt(self, ciphertext: str) -> str: pass class VigenereCipher(Cipher): @staticmethod def rotate(n: int) -> str: return string