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cartesian product in pandas
... you can produce a cartesian product using merge (like you would in SQL).
from pandas import DataFrame, merge
df1 = DataFrame({'key':[1,1], 'col1':[1,2],'col2':[3,4]})
df2 = DataFrame({'key':[1,1], 'col3':[5,6]})
merge(df1, df2,on='key')[['col1', 'col2', 'col3']]
Output:
col1 col2 col3
0 ...
How to get the instance id from within an ec2 instance?
How can I find out the instance id of an ec2 instance from within the ec2 instance?
32 Answers
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Change color of PNG image via CSS?
...edia.org/wikipedia/commons/thumb/e/ec/Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg/500px-Mona_Lisa%2C_by_Leonardo_da_Vinci%2C_from_C2RMF_retouched.jpg -->
<img alt="Mona Lisa" src="https://www.pexels.com/photo/photo-of-a-green-leaf-2563743/?auto=compress&cs=tinysrgb&d...
How can I lock a file using java (if possible)
... opens a file using a FileReader. How can I prevent another (Java) process from opening this file, or at least notify that second process that the file is already opened? Does this automatically make the second process get an exception if the file is open (which solves my problem) or do I have to ex...
What is (functional) reactive programming?
...you want to get a feel for FRP, you could start with the old Fran tutorial from 1998, which has animated illustrations. For papers, start with Functional Reactive Animation and then follow up on links on the publications link on my home page and the FRP link on the Haskell wiki.
Personally, I like...
How do I get the logfile from an Android device?
I would like to pull the log file from a device to my PC. How can I do that?
13 Answers
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.classpath and .project - check into version control or not?
...raemer: true. I have now restored those two pictures, the first one coming from archive.eclipse.org/eclipse/downloads/drops/R-3.5-200906111540/… and the second one from download.itemis.com/mirror/eclipse/R-3.6-201006080911./….
– VonC
May 26 '11 at 4:03
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How do I return the response from an asynchronous call?
... which makes an asynchronous request. How can I return the response/result from foo ?
39 Answers
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Pass Nothing from Javascript to VBScript in IE9
...ns "Nothing". In your JavaScript use "var jsNothing = GetNothing()". Comes from this article
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How to install a private NPM module without my own registry?
...nt to upload to the central registry. The question is, how do I install it from other projects?
14 Answers
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