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Creating a new column based on if-elif-else condition

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Pandas dataframe get first row of each group

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How to make div background color transparent in CSS

I'm not using CSS3. So I can't use opacity or filter attributes. Without using these attributes how can I make the background-color transparent of a div ? It should be kind of the text box example in this link . Here the text box background color is transparent. I want to make the same, but ...
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sed: print only matching group

...rab the last two numbers (one int, one float; followed by optional whitespace) and print only them. 5 Answers ...
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Numpy how to iterate over columns of array?

Suppose I have and m x n array. I want to pass each column of this array to a function to perform some operation on the entire column. How do I iterate over the columns of the array? ...
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Objective-C - Remove last character from string

In Objective-C for iOS, how would I remove the last character of a string using a button action? 4 Answers ...
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Cassandra port usage - how are the ports used?

When experimenting with Cassandra I've observed that Cassandra listens to the following ports: 7 Answers ...
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How to import a .cer certificate into a java keystore?

...the private key. The private key is provided with a .PFX keystore file normally. If you really authenticate is because you already had imported the private key. You normally can import .CER certificates without any problems with keytool -importcert -file certificate.cer -keystore keystore.jks -al...
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Can I use mstest.exe without installing Visual Studio?

...se mstest.exe to run my unit test on build server, but I don't want to install Visual Studio on the build server. Can I just install MSTest without Visual Studio? ...
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Enable 'xp_cmdshell' SQL Server

I want to execute EXEC master..xp_cmdshell @bcpquery 7 Answers 7 ...