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Way to read first few lines for pandas dataframe

Is there a built-in way to use read_csv to read only the first n lines of a file without knowing the length of the lines ahead of time? I have a large file that takes a long time to read, and occasionally only want to use the first, say, 20 lines to get a sample of it (and prefer not to load the...
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How do I add comments to package.json for npm install?

I've got a simple package.json file and I want to add a comment. Is there a way to do this, or are there any hacks to make this work? ...
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Best practice for localization and globalization of strings and labels [closed]

I'm a member of a team with more than 20 developers. Each developer works on a separate module (something near 10 modules). In each module we might have at least 50 CRUD forms, which means that we currently have near 500 add buttons , save buttons , edit buttons , etc. ...
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How can I match a string with a regex in Bash?

I am trying to write a bash script that contains a function so when given a .tar , .tar.bz2 , .tar.gz etc. file it uses tar with the relevant switches to decompress the file. ...
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How do I test if a string is empty in Objective-C?

How do I test if an NSString is empty in Objective-C? 30 Answers 30 ...
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How do I print a double value without scientific notation using Java?

I want to print a double value in Java without exponential form. 14 Answers 14 ...
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How to calculate a logistic sigmoid function in Python?

This is a logistic sigmoid function: 14 Answers 14 ...
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Paging with Oracle

I am not as familiar with Oracle as I would like to be. I have some 250k records, and I want to display them 100 per page. Currently I have one stored procedure which retrieves all quarter of a million records to a dataset using a data adapter, and dataset, and the dataadapter.Fill(dataset) method...
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Getting number of elements in an iterator in Python

Is there an efficient way to know how many elements are in an iterator in Python, in general, without iterating through each and counting? ...
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How to highlight and color gdb output during interactive debugging?

Please don't reply I should use ddd, nemiver, emacs, vim, or any other front-end, I just prefer gdb as it is, but would like to see its output with some terminal colors. ...