class

来源： https://stackoverflow.com/questions/45883083/why-should-i-use-the-property-decorator-in-python

来源： https://stackoverflow.com/questions/61607771/highlight-listbox-items-based-on-value-from-class

来源： https://stackoverflow.com/questions/35758131/create-unnamed-implicit-class-or-function

问题 In the book of "The C++ Programming Language", the author gave the following example along with several statements: Defining an operator, such as [], to be used for both reading and writing is difficult where it is not acceptable simply to return a reference and let the user decide what to do with it. Cref, is to help implement a subscript operator that distinguishes between reading and writing. Why [] is difficult to be defined when to be used for both reading and writing? How does the

问题 On a worksheet I have 3 ActiveX objects being TextBox1, TextBox2, ListBox1 Leaving other code out I have a class clsEvents that contains Private WithEvents txbControl As MSForms.TextBox Private WithEvents lisControl As MSForms.ListBox Private txbEvents As TextBoxEvents Private lisEvents As ListBoxEvents Private Sub txbControl_Change() txbEvents.ChangeEvent txbControl End Sub Private Sub lisControl_Change() lisEvents.ChangeEvent lisControl End Sub and the classes TextBoxEvents and

问题 I am defining a Class with several properties, most of which are int or float and for each I need to setup a specific string representation, is there an equivalent of __str__ or __repr__ for properties ? UPDATE: to clarify, I'd like to have a custom string representation for my int and float values such as ' 022' or ' 3.27 ' related to the actual values, not just a static string for any value. 回答1: You can create your own property object and override the intended methods. Here is an example:

问题 I am defining a Class with several properties, most of which are int or float and for each I need to setup a specific string representation, is there an equivalent of __str__ or __repr__ for properties ? UPDATE: to clarify, I'd like to have a custom string representation for my int and float values such as ' 022' or ' 3.27 ' related to the actual values, not just a static string for any value. 回答1: You can create your own property object and override the intended methods. Here is an example:

问题 I'm trying to normalize a string in ColdFusion. I want to use the Java class java.text.Normalizer for this, as CF doesn't have any similar functions as far as I know. Here's my current code: <cfset normalizer = createObject( "java", "java.text.Normalizer" ) /> <cfset string = "äéöè" /> <cfset string = normalizer.normalize(string, createObject( "java", "java.text.Normalizer$Form" ).NFD) /> <cfset string = ReReplace(string, "\\p{InCombiningDiacriticalMarks}+", "") /> <cfoutput>#string#<

问题 class Foo(object): def tick(self): print("something") class Bar(object): def __init__(self): self.foo = Foo() def tick(self): #Here's what I do.... self.foo.tick() #here's what my goal would be self.foo() b = Bar() b.tick() That's essentially my goal. From what I've gathered I could change the tick function to __call__ and that would allow me to do what I wanted. A couple of the other answers said that this would make a new instance of the object, does that mean that it would use self.foo's

问题 Would someone please explain the difference between forwarding and delegation? They seem similar, but I haven't been able to find a good definition of forwarding, so I'm not sure I really understand. 回答1: Let's first define two terms: sender : the object that sends a message/task to another object(the receiver) receiver : the object that receives a message/task from the sender The difference between forwarding and delegation is that in forwarding the receiver acts in its own context whereas