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Rails I18n validation deprecation warning

... 615 Important: Make sure your app is not using I18n 0.6.8, it has a bug that prevents the configura...
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Delete first character of a string in Javascript

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Simple Digit Recognition OCR in OpenCV-Python

... 541 Well, I decided to workout myself on my question to solve above problem. What I wanted is to imp...
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Finding duplicates in O(n) time and O(1) space

Input: Given an array of n elements which contains elements from 0 to n-1, with any of these numbers appearing any number of times. ...
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Why does (1 in [1,0] == True) evaluate to False?

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Convert columns to string in Pandas

...will convert keys to valid json (and therefore your keys to strings): In [11]: df = pd.DataFrame([['A', 2], ['A', 4], ['B', 6]]) In [12]: df.to_json() Out[12]: '{"0":{"0":"A","1":"A","2":"B"},"1":{"0":2,"1":4,"2":6}}' In [13]: df[0].to_json() Out[13]: '{"0":"A","1":"A","2":"B"}' Note: you can p...
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How should I validate an e-mail address?

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How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops

...re used for Pattern Matching. To use in Excel follow these steps: Step 1: Add VBA reference to "Microsoft VBScript Regular Expressions 5.5" Select "Developer" tab (I don't have this tab what do I do?) Select "Visual Basic" icon from 'Code' ribbon section In "Microsoft Visual Basic for Applicat...
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How to filter Pandas dataframe using 'in' and 'not in' like in SQL

... 891 You can use pd.Series.isin. For "IN" use: something.isin(somewhere) Or for "NOT IN": ~something....