with-statement | 易学教程

Variable not being stored in the code when sheet changes

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问题 I'm quite new to coding and have encountered a probably very trivial issue. When I run the code line by line in the 'Trade_Sheet' tab, the variable Date_range is picked up correctly as a date previously copied, and updated for 7 days later. However the problem comes when I run the macro in the main tab 'Share_Calc_Tab' where the macro is situated. If I do so, it seems like the variable Date_range sets to 0, and while the rest of the operation is performed, the date will be missing. The code

Does, With open() not works with python 2.6

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问题 I am trying to use "With open()" with python 2.6 and it is giving error(Syntax error) while it works fine with python 2.7.3 Am I missing something or some import to make my program work! Any help would be appreciated. Br My code is here: def compare_some_text_of_a_file(self, exportfileTransferFolder, exportfileCheckFilesFolder) : flag = 0 error = "" with open("check_files/"+exportfileCheckFilesFolder+".txt") as f1,open("transfer-out/"+exportfileTransferFolder) as f2: if f1.read().strip() in

RAII in Python - automatic destruction when leaving a scope

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I've been trying to find RAII in Python. Resource Allocation Is Initialization is a pattern in C++ whereby an object is initialized as it is created. If it fails, then it throws an exception. In this way, the programmer knows that the object will never be left in a half-constructed state. Python can do this much. But RAII also works with the scoping rules of C++ to ensure the prompt destruction of the object. As soon as the variable pops off the stack it is destroyed. This may happen in Python, but only if there are no external or circular references. More importantly, a name for an object

Extracting the collection of unique values from a filter in VBA

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问题 I have a file which has rows extending to tens of thousands across 8 columns. One particular column contains the weekend date. I have to count the number of weekends present in this file. Is there a way to extract the data as shown in the image below? If we can extract and get the count of this collection, then the problem is solved. Please help. Thanks in advance! 回答1: The following will take a series of three randomized upper-case letters from column A (25K values), put them into a

C# equivalent for Visual Basic keyword: 'With' … 'End With'?

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问题 In Visual Basic, if you are going to change multiple properties of a single object, there's a With/End With statement: Dim myObject as Object // ' Rather than writing: myObject.property1 = something myObject.property2 = something2 // ' You can write: with myObject .property1 = something .property2 = something2 ... End With I know C# can do it when creating a new object: Object myObject = new Object { property1 = something, property2 = something2, ...}; But how do I do that if myOject is

Meaning of “with” statement without “as” keyword

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问题 I'm familiar with using python's with statement as a means of ensuring finalization of an object in the event of an exception being thrown. This usually looks like with file.open('myfile.txt') as f: do stuff... which is short-hand for f = file.open('myfile.txt'): try: do stuff... finally: f.close() or whatever other finalization routine a class may present. I recently came across a piece of code dealing with OpenGL that presented this: with self.shader: (Many OpenGL commands) Note that

Getting the block of commands that are to be executed in the with statement

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问题 In reading the specifications for the with statement (link), I have some things I'd like to play around with. This isn't for any production code or anything, I'm just exploring, so please don't be too harsh if this is a bad idea. What I'd like to do is grab the piece called "BLOCK" in the linked docs above, and actually tinker around with it inside of the call to __enter__ . (See the linked doc, just after the start of the motivation and summary section.) The idea is to create my own sort of

Python Multiprocessing Lib Error (AttributeError: exit)

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Am getting this error when using the pool.map(funct, iterable) : AttributeError: __exit__ No Explanation, only stack trace to the pool.py file within the module. using in this way: with Pool(processes=2) as pool: pool.map(myFunction, mylist) pool.map(myfunction2, mylist2) I suspect there could be a problem with the picklability (python needs to pickle , or transform list data into byte stream) yet I'm not sure if this is true or if it is how to debug. EDIT: new format of code that produces this error : def governingFunct(list): #some tasks def myFunction(): # function contents with closing

The VB.NET 'With' Statement - embrace or avoid?

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At work, I'm frequently working on projects where numerous properties of certain objects have to be set during their construction or early during their lifetime. For the sake of convenience and readability, I often use the With statement to set these properties. I find that With Me.Elements .PropertyA = True .PropertyB = "Inactive" ' And so on for several more lines End With Looks much better than Me.Elements.PropertyA = True Me.Elements.PropertyB = "Inactive" ' And so on for several more lines for very long statements that simply set properties. I've noticed that there are some issues with

Conditional with statement in Python

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问题 Is there a way to begin a block of code with a with statement, but conditionally? Something like: if needs_with(): with get_stuff() as gs: # do nearly the same large block of stuff, # involving gs or not, depending on needs_with() To clarify, one scenario would have a block encased in the with statement, while another possibility would be the same block, but not encased (i.e., as if it wasn't indented) Initial experiments of course give indentation errors.. 回答1: If you want to avoid