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Limiting Python input strings to certain characters and lengths

I just started learning my first real programming language, Python. I'd like to know how to constrain user input ... it. Can anyone help? See Question&Answers more detail:os...

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android - Getting started with Open NFC emulator

I would like to get started with developing NFC apps for android. I have started with android recently and I' ... NFC enabled state to true See Question&Answers more detail:os...

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

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PHP / MySQL build tree menu

I am trying to build an un-oredered list menu tree from my database in PHP and MySQL. I have an array of ... and it will return the html list. 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# - convert an enum to another type of enum

I have an enum of for example 'Gender' (Male =0 , Female =1) and I have another enum from a service ... to convert from their enum to mine? 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 check that an object is empty in PHP?

How to find if an object is empty or not in PHP. Following is the code in which $obj is holding XML ... code: $obj = simplexml_load_file($url); 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 - Detect enter press in JTextField

Is it possible to detect when someone presses Enter while typing in a JTextField in java? Without having to create a ... set it as the default. See Question&Answers more detail:os...

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configuration - PHP Warning: Module already loaded in Unknown on line 0

On Mac OSX Mavericks using homebrew php55 whenever I run a a php command I get the following error message ( ... look. Any help is appreciated See Question&Answers more detail:os...

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html - add title attribute from css

How to add title='mandatory' from css to the following <label class='mandatory'>Name</label> .mandatory { ... 10px; font-weight:bold; } See Question&Answers more detail:os...

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date - Datetime in C# add days

I want to add days in some date. I have a code like this: DateTime endDate = Convert.ToDateTime(this.txtStartDate ... stupid mistake I'm doing? See Question&Answers more detail:os...

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MySQL How do you INSERT INTO a table with a SELECT subquery returning multiple rows?

MySQL How do you INSERT INTO a table with a SELECT subquery returning multiple rows? INSERT INTO Results ( People, ... returns more than 1 row See Question&Answers more detail:os...

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r - Plotting with ggplot2: "Error: Discrete value supplied to continuous scale" on categorical y-axis

The plotting code below gives Error: Discrete value supplied to continuous scale What's wrong with this code? ... looked before adding scale: See Question&Answers more detail:os...

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android - Get context inside onClick(DialogInterface v, int buttonId)?

Getting the context inside onClick(View view), the callback for a button's onClickListener(), is easy: ... .OnClickListener Is this possible? See Question&Answers more detail:os...

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visual studio 2012 - Specifying results filename for vstest.console.exe

May be a silly question, but does anybody know how to specify the output filename of a VSTEST.Console.exe run? ... be missing something here... See Question&Answers more detail:os...

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oracle - What does the colon sign ":" do in a SQL query?

What does : stand for in a query? INSERT INTO MyTable (ID) VALUES (:myId) How does it fetch the desired value? ... but what's the name for :? See Question&Answers more detail:os...

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ios - Swift error : signal SIGABRT how to solve it

I'm just a beginner in Swift coding. My idea is quite simple which is an app with two buttons. When clicked, ... What is wrong with my code? See Question&Answers more detail:os...

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Android - ListView - performItemClick

I'm facing some difficults when I try to use the performItemClick funcion of the ListView. All I want to do is ... null) Thank you in advance! See Question&Answers more detail:os...

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Extract the text out of HTML string using JavaScript

I am trying to get the inner text of HTML string, using a JS function(the string is passed as an argument). Here is ... ://w3c.org'>W3C</a>"); See Question&Answers more detail:os...

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c# - Azure Shared Access Signature - Signature did not match

I'm getting this error: <Error> <Code>AuthenticationFailed</Code> <Message> Server failed to authenticate the ... are greatly appreciated :-) See Question&Answers more detail:os...

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csv - How can I correct MySQL Load Error

I'm not quite sure a similar question to this was closed by I'm trying to execute the following MySQL program. ... (i686) using readline 6.2 See Question&Answers more detail:os...

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oop - Advantage of Local Classes Java

What is the advantage of local classes in Java or in any other language that makes use of this feature? See Question&Answers more detail:os...

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iphone - Display keyboard without animation

Looked intoUIKeyboardAnimationDurationUserInfoKey but I just can't find anywhere how to set it to a custom value. See Question&Answers more detail:os...

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r - Delete columns/rows with more than x% missing

I want to delete all columns or rows with more than 50% NAs in a data frame. This is my solution: # ... I would also appreciate a dplyr solution See Question&Answers more detail:os...

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Long-running ssh commands in python paramiko module (and how to end them)

I want to run a tail -f logfile command on a remote machine using python's paramiko module. I've been ... of getting output- any thoughts? 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 - Conditional logging with log4j

The web application on which I am working occasionally develops data integrity issues for some of the users. I'd ... other than hard-coding it. See Question&Answers more detail:os...

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swift - Using a Type Variable in a Generic

I have this question except for Swift. How do I use a Type variable in a generic? I tried this: func intType() -> ... var arr = Array<t>() } } See Question&Answers more detail:os...

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c# - How to hide wpf datagrid columns depending on a property

I have the following WPF sample program: Xaml: <Window x:Class="AncestorArie.MainWindow" xmlns="http:/ ... concerning the Visibility attribute? See Question&Answers more detail:os...

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

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compression - How do you unzip very large files in python?

Using python 2.4 and the built-in ZipFile library, I cannot read very large zip files (greater than 1 or 2 ... 't as cross-platform, obviously). 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 - Changing Persistence Unit dynamically - JPA

Persistence units in persistence.xml are created during building the application. As I want to change the database url ... EclipseLink (JPA 2.1) See Question&Answers more detail:os...

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

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