class

问题 Without subclassing dict, what would a class need to be considered a mapping so that it can be passed to a method with ** from abc import ABCMeta class uobj: __metaclass__ = ABCMeta uobj.register(dict) def f(**k): return k o = uobj() f(**o) # outputs: f() argument after ** must be a mapping, not uobj At least to the point where it throws errors of missing functionality of mapping, so I can begin implementing. I reviewed emulating container types but simply defining magic methods has no effect

问题 I have a base class, a bunch of subclasses, and for each of these subclasses, I have another set of sub-subclasses. For example: class BaseClass(object): def __init__(self): with open(config.txt) as f self.config_array = f.readlines() class FirstOrderSubClass(BaseClass): def __init__(self, name): self.name = name class SecondOrderSubClass(FirstOrderSubClass): def __init__(self, name, version): self.name = name self.version = version super(SecondOrderSubClass, self).__init__(self.name) #

问题 Here is a sample python module: # foo.py class Foo(object): a = {} def __init__(self): print self.a self.filla() def filla(self): for i in range(10): self.a[str(i)] = i then I do this in python shell: $ python Python 2.7.2 (default, Jan 13 2012, 17:11:09) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from foo import Foo >>> f = Foo() {} >>> f = Foo() {'1': 1, '0': 0, '3': 3, '2': 2, '5': 5, '4': 4, '7': 7, '6':

问题 is there any way to simplify this code into a few lines, I have a class with string seq(number) has {get;set} functions. I am getting lucio and textValue from another class. public static void setCategorySeq(string lucio, string textValue) { if (lucio == "0") { seq0 = textValue; } else if (lucio == "1") { seq1 = textValue; } else if (lucio == "2") { seq2 = textValue; } else if (lucio == "3") { seq3 = textValue; } else if (lucio == "4") { seq4 = textValue; } else if (lucio == "5") { seq5 =

问题 is there any way to simplify this code into a few lines, I have a class with string seq(number) has {get;set} functions. I am getting lucio and textValue from another class. public static void setCategorySeq(string lucio, string textValue) { if (lucio == "0") { seq0 = textValue; } else if (lucio == "1") { seq1 = textValue; } else if (lucio == "2") { seq2 = textValue; } else if (lucio == "3") { seq3 = textValue; } else if (lucio == "4") { seq4 = textValue; } else if (lucio == "5") { seq5 =

问题 I am trying to implement in my code the excellent advice in the F# coding conventions page https://docs.microsoft.com/en-us/dotnet/fsharp/style-guide/conventions. The section Use classes to contain values that have side effects is particularly interesting. It says There are many times when initializing a value can have side effects, such as instantiating a context to a database or other remote resource. It is tempting to initialize such things in a module and use it in subsequent functions.

问题 class Thing(object): def sound(self): return '' #Silent class Animal(Thing): def sound(self): return 'Roar!' class MuteAnimal(Animal): def sound(self): return '' #Silent Is there a pattern in python for MuteAnimal 's sound to refer to its grandparent class Thing 's implementation? (eg super(MuteAnimal,self).super(Animal.self).sound() ?) Or is Mixin a better use case here? 回答1: As said by Alexander Rossa in Python inheritance - how to call grandparent method? : There are two ways to go around

问题 I downloaded and installed UMD's FindBugs 3.0 in /usr/local/share/findbugs-3.0 : $ ls /usr/local/share/findbugs-3.0/ FindBugs.jar I have a little script to run it: $ cat ./findbugs FINDBUGS_HOME=/usr/local/share/findbugs-3.0 java -jar $FINDBUGS_HOME/FindBugs.jar $* Running the script results in: $ ./findbugs Error: Could not find or load main class edu.umd.cs.findbugs.bluej.FindBugsExtension Dumping the JAR : $ jar tf /usr/local/share/findbugs-3.0/FindBugs.jar | grep "edu/umd/cs/findbugs

问题 I'm using the following piece of code in my webpage to change the class of select elements depending on the choice of a radio button. The part where I add the class works fine but the other (where I remove them) doesn't work. I get no error in the Error console and when I changed my code to have the part that removes the class put another class to the select elements it worked fine. <script type="text/javascript"> window.addEvent('domready', function(){ $('votconj').addEvent('click', function

问题 I'm using the following piece of code in my webpage to change the class of select elements depending on the choice of a radio button. The part where I add the class works fine but the other (where I remove them) doesn't work. I get no error in the Error console and when I changed my code to have the part that removes the class put another class to the select elements it worked fine. <script type="text/javascript"> window.addEvent('domready', function(){ $('votconj').addEvent('click', function