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python - ValueError: Length of values does not match length of index | Pandas DataFrame.unique()

I am trying to get a new dataset, or change the value of the current dataset columns to their unique values. ... length of index" both times. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql server 2008 - Select a Column in SQL not in Group By

I have been trying to find some info on how to select a non-aggregate column that is not contained ... ' group by cpe.fmgcms_cpeclaimid See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why should java package name be lowercase?

Actually this is completely theoretic question. But it's interesting why java specification don't ... .core.remoteFileSystemSynchronization.* See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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css - Why doesn't inset box-shadow work over images?

I have a container that uses inset box shadow. The container contains images and text. The inset shadow ... overlap images? Live demo See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - How can I make a DateTimePicker display an empty string?

I would like to be able to display a DateTimePicker that has a default value of nothing, i.e. no date. For ... remain here for others to find.. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Python Add Comma Into Number String

Using Python v2, I have a value running through my program that puts out a number rounded to 2 decimal places at ... 000.00 Thanks for any help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I declare an array as a constant in Objective-c?

The following code is giving me errors: // constants.h extern NSArray const *testArray; // constants.m NSArray ... Objective-C class 'NSArray' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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apache - Debug message "Resource interpreted as other but transferred with MIME type application/javascript"

OK, I understand what the messages means, but I'm really not sure what's causing it. I'm using Safari and ... to resolve it? Cheers all, Gaz. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - How to subtract years?

I have a date in R, e.g.: dt = as.Date('2010/03/17') I would like to subtract 2 years from this date, ... 2010-03-17'). How would I do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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hash - Why are XOR often used in java hashCode() but another bitwise operators are used rarely?

I often see code like int hashCode(){ return a^b; } Why XOR? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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serialization - Android - SharedPreferences with serializable object

I know that SharedPreferences has putString(), putFloat(), putLong(), putInt() and putBoolean(). But I need to ... . How can I achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Why onDraw is not called after invalidate()?

I have found many posts on stackoverflow but I still cannot solve my problem. Here is my code piece: public class ... b1. Thank you very much! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Multipart File upload Spring Boot

Im using Spring Boot and want to use a Controller to receive a multipart file upload. When sending the file I ... .out.println(e.toString()); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - What are the principles behind, and benefits of, the "party model"?

The "party model" is a "pattern" for relational database design. At least part of it involves finding commonality ... I'm facing. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Java generic methods in generics classes

If you create a generic class in Java (the class has generic type parameters), can you use generic methods (the ... is untyped / raw-typed. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Run Selenium tests in multiple browsers one after another from C# NUnit

I'm looking for the recommended/nicest way to make Selenium tests execute in several browsers one after ... with different browser parameters. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Which is a better write barrier on x86: lock+addl or xchgl?

The Linux kernel uses lock; addl $0,0(%%esp) as write barrier, while the RE2 library uses xchgl (%0),%0 ... available. When is lfence required? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Screen Resolution Problem In WPF?

I'm gonna detect the resolution with the following code in WPF : double height = System.Windows.SystemParameters. ... ? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iphone - Make app appear as iOS 8 Suggested App at lockscreen

As iOS 8 is out, there is a feature that show "Suggested App" on lockscreen based on your location. The ... when user is around these locations? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Dynamic tag names with JAXB

I am using Jersey and JAXB to build a simple RESTful webservice I have a HashMap of 'String' to 'Integer' ... dynamic tag names with JAXB? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Angularjs: understanding a recursive directive

I found a great tree directive here. Original: http://jsfiddle.net/n8dPm/ I have been trying to understand the functioning ... ); }); }; }, See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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uikit - iPhone development: How to create colored or translucent background for UIActionSheet?

When you try deleting a note in iPhone's Notes application, an UIActionSheet pops up. The sheet is ... UIActionSheet a certain color? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to add not null constraint to existing column in MySQL

I have table name called "Person" with following column names P_Id(int), LastName(varchar), FirstName (varchar). ... getting syntax error.... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - class method generates "TypeError: ... got multiple values for keyword argument ..."

If I define a class method with a keyword argument thus: class foo(object): def foodo(thing=None, thong='not ... 'thing' What's going on? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Copy constructor in python?

Is there a copy constructor in python ? If not what would I do to achieve something similar ? The situation is ... to instances of my own class. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - When are .pyc files refreshed?

I understand that ".pyc" files are compiled versions of the plain-text ".py" files, created at ... have stricter checking during development? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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MySQL - how many rows can I insert in one single INSERT statement?

Does it depend on the number of values sets? Does it depend on the number of bytes in the INSERT statement? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bash - Openssh Private Key to RSA Private Key

(I am using MAC) My id_rsa starts with -----BEGIN OPENSSH PRIVATE KEY----- but I expect it to starts ... should also transfer this. Thank you! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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