function-calls | 易学教程

Calling “del” on result of Function call results in “SyntaxError: can't delete function call”

阅读更多关于 Calling “del” on result of Function call results in “SyntaxError: can't delete function call”

问题 Consider below example: random_tile = random.choice(tiles) del random_tile It first assigns a random element from the list tiles to a variable, and then calls a function on that variable. Then if we want to shorten the code as follows: del random.choice(tiles) We would get a SyntaxError: can't delete function call . I tried eval() with no luck. How can this be solved? EDIT: What I am trying to do is to remove a element from the tiles list at random . I thought I found a more compact way of

How to maintain lists and dictionaries between function calls in Python?

阅读更多关于 How to maintain lists and dictionaries between function calls in Python?

问题 I have a function. Inside that I'm maintainfing a dictionary of values. I want that dictionary to be maintained between different function calls Suppose the dic is : a = {'a':1,'b':2,'c':3} At first call,say,I changed a[a] to 100 Dict becomes a = {'a':100,'b':2,'c':3} At another call,i changed a[b] to 200 I want that dic to be a = {'a':100,'b':200,'c':3} But in my code a[a] doesn't remain 100.It changes to initial value 1. I need an answer ASAP....I m already late...Please help me friends...

Is it possible to call matlab functions from Silverlight / C#?

阅读更多关于 Is it possible to call matlab functions from Silverlight / C#?

问题 Is it possible to call matlab functions from Silverlight / C# ? 回答1: If you have an assembly (dll) that can interpret Mathlab calls, you should be able to include that assembly in your project and compile it with the rest of your application. Obviously, you won't be able to run Silverlight side-by-side to interface with an installed instance of Matlab (unless the API is exposed through COM interop and using Silverlight 4, but that could get messy). The Web API on sourceforge, as mentioned by

Is it possible to call matlab functions from Silverlight / C#?

阅读更多关于 Is it possible to call matlab functions from Silverlight / C#?

jQuery ajax calling javascript function

阅读更多关于 jQuery ajax calling javascript function

问题 I am using jQuery and Ajax. My MainFile has the following code: <html> <head> <script src="Myscript.js"> </script> <script type="text/javascript"> $(document).ready(function(){ $.ajax({ type: 'POST', url: 'ajax.php', success: function(data){ $("#response").html(data); } }); }); </script> <body> <div id="response"> </div> </body> </html> My ajax.php get the sample data ... MyScript.js has the following function display (text,corner) { } .. I have Myscript.js. In this, I have a function called

Multiple jQuery events on one element with different functions and target selectors

阅读更多关于 Multiple jQuery events on one element with different functions and target selectors

问题 Is there a way to combine these two methods of handling the event attachment in jQuery? $('selector').on({ mouseenter: function() {}, mouseleave: function() {}, mousedown: function() {}, mouseup: function() {} }); I prefer the previous method but need something like the following to work with "live"-events (the problem is that this will not work if there's a comment between the handlers): $(document).on('mouseenter', 'selector1', function(){}) .on('mouseleave', 'selector2', function(){}) .on(

Help Defining Global Names

阅读更多关于 Help Defining Global Names

问题 My Code: def A(): a = 'A' print a return def B(): print a + ' in B' return When B() is entered into the interpeter I get Traceback (most recent call last): File "<interactive input>", line 1, in <module> File "<module1>", line 9, in B NameError: global name 'a' is not defined How should I go about defining a? I want the end result to be 'A in B', when B() is entered into the interpreter edit: I'd like to keep the definition of a within A() if possible. 回答1: i'm pretty new to Python and you

Passing functions which have multiple return values as arguments in Python

阅读更多关于 Passing functions which have multiple return values as arguments in Python

问题 So, Python functions can return multiple values. It struck me that it would be convenient (though a bit less readable) if the following were possible. a = [[1,2],[3,4]] def cord(): return 1, 1 def printa(y,x): print a[y][x] printa(cord()) ...but it's not. I'm aware that you can do the same thing by dumping both return values into temporary variables, but it doesn't seem as elegant. I could also rewrite the last line as "printa(cord()[0], cord()[1])", but that would execute cord() twice. Is

Python - Can I access the object who call me?

阅读更多关于 Python - Can I access the object who call me?

问题 If I have this: class A: def callFunction(self, obj): obj.otherFunction() class B: def callFunction(self, obj): obj.otherFunction() class C: def otherFunction(self): # here I wan't to have acces to the instance of A or B who call me. ... # in main or other object (not matter where) a = A() b = B() c = C() a.callFunction(c) # How 'c' know that is called by an instance of A... b.callFunction(c) # ... or B Despite the design or other issues, this is only a question of an inquiring mind. Note:

Python - Can I access the object who call me?

阅读更多关于 Python - Can I access the object who call me?