global

问题 I have two modules, a.py and b.py. I want the globals from a.py to be available in b.py like this: a.py: #!/usr/bin/env python var = "this is global" import b b.foo() b.py: #!/usr/bin/env python var = "this is global" def foo(): print var Currently, I re-declare the globals in each module. There must be an easier way. 回答1: Create a settings module that has shared globals if that's what you want. That way you're only importing and referencing each global one time, and you're keeping them

问题 I want to have a class which has as a member a pointer to a function here is the function pointer: typedef double (*Function)(double); here is a function that fits the function pointer definition: double f1(double x) { return 0; } here is the class definion: class IntegrFunction { public: Function* function; }; and somewhere in the main function i want to do something like this: IntegrFunction func1; func1.function = f1; But, this code does not work. Is it possible to assign to a class member

问题 I have a list that I create inside of function1 . I want to be able to access and modify it in function2 . How can I do this without a global variable? Neither function is nested within the other and I need to be able to generalize this for multiple lists in several functions. I want to be able to access word_list and sentence_starter in other functions. def Markov_begin(text): print create_word_lists(text) print pick_starting_point(word_list) return starting_list def create_word_lists

问题 I have a list that I create inside of function1 . I want to be able to access and modify it in function2 . How can I do this without a global variable? Neither function is nested within the other and I need to be able to generalize this for multiple lists in several functions. I want to be able to access word_list and sentence_starter in other functions. def Markov_begin(text): print create_word_lists(text) print pick_starting_point(word_list) return starting_list def create_word_lists

问题 I have have "Project A" with "MyResourceDictionary.xaml" in "App.xaml" <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="MyResourceDictionary.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> I want to also use "MyResourceDictionary.xaml" in my user control library - "Project B" Can I do this? Thanks, Eamonn 回答1: Check out the pack URI syntax. Something like: <ResourceDictionary Source

问题 I know a pointer is usually assigned upon its declaration, but I wondering if there's any way to create a global pointer in C. For example my code below: is it a good practice? static int *number_args = NULL; void pro_init(int number) { number_args = &number; /* initialize the pointer value -- is this okay? */ } 回答1: Avoid globals - They are a bad idea and usually lead into problems. You are taking an address of a variable on the stack. That will get reused somewhere down the line and hence

问题 In my WPF app, I want an object "CaseDetails" to be used globally i.e. by all windows & user controls. CaseDetails implements INotifyPropertyChanged, and has a property CaseName. public class CaseDetails : INotifyPropertyChanged { private string caseName, path, outputPath, inputPath; public CaseDetails() { } public string CaseName { get { return caseName; } set { if (caseName != value) { caseName = value; SetPaths(); OnPropertyChanged("CaseName"); } } } protected virtual void

问题 I used to have a jQuery app, that had a 'keydown' event once the document was ready. Basically, anytime a user hit a key, it would match the keycode and do something. Now I ported this app to Ember and life became difficult for 2 reasons: 1) The only time a 'keyDown' event can be registered is when the containing element/View has a focus on it. The only way this can be done with non-input fields is by setting the tabindex value, to achieve this, I do this: didInsertElement:function(){ this.$(

问题 Is it possible to bind all widgets to one command, with a single line? It would be nice if I could type in one line as opposed to doing each widget individually. 回答1: You would use the bind_all method on the root window. This will then apply to all widgets (unless you remove the bindtag "all" from some widgets). Note that these bindings fire last, so you can still override the application-wide binding on specific widgets if you wish. Here's a contrived example: import Tkinter as tk class App:

问题 I have to cache an object hierarchy in-memory for performance reasons, which reflects a simple database table with columns (ObjectID, ParentObjectID, Timestamp) and view CurrentObjectHierarchy. I query the CurrentObjectHierarchy and use a hash table to cache the current parents of each object for quickly looking up the parent object ID, given any object ID. Querying the database table and constructing the cache is a 77ms operation on average, and ideally this refresh occurs only when a method