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To find whether a column exists in data frame or not

... | edited Apr 28 '12 at 15:09 answered Apr 23 '12 at 7:03 ...
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How to get the index of an item in a list in a single step?

...) operation, where n is Count. If the item is not found, it will return -1 share | improve this answer | follow | ...
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Git: how to reverse-merge a commit?

... 106 To create a new commit that 'undoes' the changes of a past commit, use: $ git revert <comm...
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When is it better to use an NSSet over an NSArray?

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Can PostgreSQL index array columns?

... 184 Yes you can index an array, but you have to use the array operators and the GIN-index type. E...
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How to compute the sum and average of elements in an array?

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Find which commit is currently checked out in Git

... 182 You have at least 5 different ways to view the commit you currently have checked out into your...
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How do I find the time difference between two datetime objects in python?

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Skip first entry in for loop in python?

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How to manually install an artifact in Maven 2?

... 147 You need to indicate the groupId, the artifactId and the version for your artifact: mvn insta...