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python - How to select all columns, except one column in pandas?

I have a dataframe look like this: import pandas import numpy as np df = DataFrame(np.random.rand(4,4), ... get all columns except column b? See Question&Answers more detail:os...

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

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postgresql - Copy a table from one database to another in Postgres

I am trying to copy an entire table from one database to another in Postgres. Any suggestions? See Question&Answers more detail:os...

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

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Difference between string and text in rails?

I'm making a new web app using Rails, and was wondering, what's the difference between string and text? And when should each be used? See Question&Answers more detail:os...

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

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algorithm - How to implement tag system

I was wondering what the best way is to implement a tag system, like the one used on SO. I was ... important that the query executes fast. See Question&Answers more detail:os...

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

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ide - How do I "Add Existing Item" an entire directory structure in Visual Studio?

I have a free standing set of files not affiliated with any C# project at all that reside in a complicated ... files in Visual Studio 2008? See Question&Answers more detail:os...

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

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tensorflow - Understanding TensorBoard (weight) histograms

It is really straightforward to see and understand the scalar values in TensorBoard. However, it's not clear ... =learning_rate).minimize(loss) See Question&Answers more detail:os...

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

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linux - MySQL fails on: mysql "ERROR 1524 (HY000): Plugin 'auth_socket' is not loaded"

My local environment is: fresh Ubuntu 16.04 with PHP 7 with installed MySQL 5.7 sudo apt-get install mysql-common ... somehow got to 1) again. See Question&Answers more detail:os...

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

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ubuntu - nginx - nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)

All of a sudden I am getting the below nginx error * Restarting nginx * Stopping nginx nginx ...done. * ... update apt get install nginx-full See Question&Answers more detail:os...

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

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objective c - boundingRectWithSize for NSAttributedString returning wrong size

I am trying to get the rect for an attributed string, but the boundingRectWithSize call is not respecting the size ... a rect for wrapped text? 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 splash screen sizes for ldpi,mdpi, hdpi, xhdpi displays ? - eg : 1024X768 pixels for ldpi

I have to design splash screens(images that fit screen while loading) for android application using phonegap. I have ... gap:density="xhdpi" /> See Question&Answers more detail:os...

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

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geolocation - How to calculate distance from Wifi router using Signal Strength?

I would like to calculate the exact location of a mobile device inside a building ( so no GPS access) ... GoogleGears-Wi-Fi-Geo-Locator-Secrets See Question&Answers more detail:os...

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

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jsp - Differences between cookies and sessions?

I am training in web developement and am learning about JSP & Servlets. I have some knowledge of HttpSession ... the differences between them? See Question&Answers more detail:os...

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

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491 views

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ssh - Bitvise SH Client Installation error. CreateDirectory() failed: Windows error 5: Access is denied

I'm trying to install bit vise ssh client but its not installing and throwing an exception as this. Exception ... to install it properly ! See Question&Answers more detail:os...

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

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PostgreSQL: Show tables in PostgreSQL

What's the equivalent to show tables (from MySQL) in PostgreSQL? See Question&Answers more detail:os...

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

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github - How can I rollback a git repository to a specific commit?

My repo has 100 commits in it right now. I need to rollback the repository to commit 80, and remove all the ... . Is there a simpler way? See Question&Answers more detail:os...

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

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github - Calculate RSA key fingerprint

I need to do the SSH key audit for GitHub, but I am not sure how do find my RSA key fingerprint. I ... to find my current RSA key fingerprint? See Question&Answers more detail:os...

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

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Push local Git repo to new remote including all branches and tags

I have a local Git repo that I would like to push to a new remote repo (brand new repo set up on Beanstalk, ... of my local repo on the remote? See Question&Answers more detail:os...

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

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git - Add all files to a commit except a single file?

I have a bunch of files in a changeset, but I want to specifically ignore a single modified file. Looks ... -u -except main/dontcheckmein.txt See Question&Answers more detail:os...

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

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ios - What's the difference between all the Selection Segues?

Show Show Detail Present Modally Popover presentation Custom What is the difference between them? I couldn' ... -storyboard/StoryboardSegue.html 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 - Difference between SPI and API?

What is the difference between Service Provider Interface (SPI) and Application Programming Interface (API)? More ... API and/or SPI? See Question&Answers more detail:os...

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

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Finding JavaScript memory leaks with Chrome

I've created a very simple test case that creates a Backbone view, attaches a handler to an event, and ... @Jonathan Naguin's answer below. 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 - What is the difference between `throw new Error` and `throw someObject`?

I want to write a common error handler which will catch custom errors thrown on purpose at any instance of ... the above two mentioned methods? See Question&Answers more detail:os...

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

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Best way to allow plugins for a PHP application

I am starting a new web application in PHP and this time around I want to create something that people can ... can attach to specific events? See Question&Answers more detail:os...

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

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484 views

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browser - HTML 5 Favicon - Support?

I was reading the Favicon page on Wikipedia. They mention the HTML 5 spec for Favicon: The current HTML5 ... other than the Wikipedia Article. 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 - Is there a way to show a WHERE clause just for one field in MySQL?

I do have some courses, to which students can enroll. There's a users table (usuarios), a courses (cursos) ... . Is that possible within MySQL? See Question&Answers more detail:os...

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

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ios - Valid file path for archiverootobject and unarchiverootobject

I am making an iPhone app and in a previous question I was told that I needed a valid file path for ... still works would anyone know why? See Question&Answers more detail:os...

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

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284 views

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javascript - HTML Alignment Issue in one machine only (both IE8)

I have the following HTML and CSS code. It works fine in IE8 in one machine; but misaligns in second machine ... : Align contents inside a div See Question&Answers more detail:os...

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

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getElementsByTagName in JavaScript

I'm new to the syntax of pure JavaScript; Do you know why "getElementsByTagName" is not working in my simple ... ).innerHTML="test"; } Fiddle See Question&Answers more detail:os...

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

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