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python - Replacing Pandas or Numpy Nan with a None to use with MysqlDB

I am trying to write a Pandas dataframe (or can use a numpy array) to a mysql database using MysqlDB . MysqlDB ... convert the 'nan' into a NoneType. Any ideas? Question&Answers:os...

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

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983 views

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class - Types and classes of variables

Two R questions: What is the difference between the type (returned by typeof) and the class (returned by ... What are possible types and classes of variables? Question&Answers:os...

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

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313 views

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javascript - How to do a deep comparison between 2 objects with lodash?

I have 2 nested objects which are different and I need to know if they have a difference in one of ... use recursive functions or something with lodash... Question&Answers:os...

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

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Objective-C sample code for HMAC-SHA1

Closed. This question needs to be more focused. It is not currently accepting answers. Question&Answers:os...

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

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python - How can I filter a Django query with a list of values?

I'm sure this is a trivial operation, but I can't figure out how it's done. There's got to be something ... I filter a Django query with a list of values? Question&Answers:os...

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

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206 views

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python - Find maximum value of a column and return the corresponding row values using Pandas

Using Python Pandas I am trying to find the Country & Place with the maximum value. This returns the maximum ... I get the corresponding Country and Place name? Question&Answers:os...

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

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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala APIs)?

Why do Scala and frameworks like Spark and Scalding have both reduce and foldLeft? So then what's the difference between reduce and fold? Question&Answers:os...

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

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Add new item count to icon on button - Android

I'm developer. I need to implement design shown below. I already have functional app but wonder how to even approach ... to style it to make it look like this. Question&Answers:os...

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

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ssl - Does Java support Let's Encrypt certificates?

I am developing a Java application that queries a REST API on a remote server over HTTP. For security reasons this ... box". Do you have good news for me? Question&Answers:os...

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

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Multi flavor app based on multi flavor library in Android Gradle

My app has several flavors for several markets in-app-billing systems. I have a single library which shares the base code ... ! I'm using android studio 0.8.2. Question&Answers:os...

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

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397 views

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Blur or dim background when Android PopupWindow active

I would like to be able to either blur or dim the background when I show my popup window using popup. ... can I do blurring/dimming just with popups? Question&Answers:os...

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

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iphone - View Controllers: How to switch between views programmatically?

In short: I want to have two fullscreen views, where I can switch between view A and view B. I know I ... have to figure out how to replicate that, right? Question&Answers:os...

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

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ios - Navigation controller custom transition animation

I've been following some tutorials to create custom animation while transitioning from one view to another. My ... to work on modal vs controller transitioning. Question&Answers:os...

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

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Converting pfx to pem using openssl

How to generate a .pem CA certificate and client certificate from a PFX file using OpenSSL. Question&Answers:os...

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

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561 views

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Android ADB device offline, can't issue commands

I can't connect to my device anymore using ADB through the command line or in Eclipse. Running the command ... SDK manager and update the tools! Then reboot. Question&Answers:os...

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

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191 views

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html - Setting a max character length in CSS

I am making responsive website for school and my question is: How do I set a max character length of the ... flexbox and media queries to make it responsive. Question&Answers:os...

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

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163 views

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python - Add list to set?

Tested on Python 2.6 interpreter: >>> a=set('abcde') >>> a set(['a', 'c', 'b', 'e', 'd']) ... ? EDIT: I want to add the list itself, not its elements. Question&Answers:os...

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

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algorithm - Find the shortest path in a graph which visits certain nodes

I have a undirected graph with about 100 nodes and about 200 edges. One node is labelled 'start', one is 'end' ... - it represents a corn maze in Lancaster, PA) Question&Answers:os...

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

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376 views

1 answer

c++ - What is the best way to concatenate two vectors?

I'm using multitreading and want to merge the results. For example: std::vector<int> A; std::vector<int ... the most efficient way of doing something like this? Question&Answers:os...

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

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python - Where's my JSON data in my incoming Django request?

I'm trying to process incoming JSON/Ajax requests with Django/Python. request.is_ajax() is True on the request, but ... JSON data being sent up in the request. Question&Answers:os...

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

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351 views

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javascript - Why can I not throw inside a Promise.catch handler?

Why can't I just throw an Error inside the catch callback and let the process handle the error as if it were ... why the Error gets swallowed by a black hole? Question&Answers:os...

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

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92 views

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java - Difference of Maven JAXB plugins

I have determined that two JAXB plugins for Maven 2 exist, with some different configurations. The one is from ... artifactId> and still the one from Codehouse. Question&Answers:os...

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

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201 views

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python - How to send email via Django?

In my settings.py, I have the following: EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend' # Host ... and EmailMessage.send() is used instead? Question&Answers:os...

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

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158 views

1 answer

c++ - What is this smiley-with-beard expression: "<:]{%>"?

I came across the following program, which compiles without errors or even warnings: int main(){ <:]{%>; // ... program do, and what is that smiley-expression? Question&Answers:os...

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

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ecmascript 6 - How can I clone a JavaScript object except for one key?

I have a flat JS object: {a: 1, b: 2, c: 3, ..., z:26} I want to clone the object except for one ... way to do this (preferring to use es6/7 if possible)? Question&Answers:os...

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

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770 views

1 answer

unix - Is there any simple way to benchmark Python script?

Usually I use shell command time. My purpose is to test if data is small, medium, large or very large set, how ... tools for Linux or just Python to do this? Question&Answers:os...

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

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109 views

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sql - How do I check if a column is empty or null in MySQL?

I have a column in a table which might contain null or empty values. How do I check if a column is empty or null in the rows ... or '' or ' ' or ' ' and ...) Question&Answers:os...

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

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279 views

1 answer

ios - iPhone - Grand Central Dispatch main thread

I have been using with success, grand central dispatch in my apps, but I was wondering what is the real advantage ... right? I wonder what do you guys think. Question&Answers:os...

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

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