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Strings in a DataFrame, but dtype is object
...ndarray. Every element in a ndarray must has the same size in byte. For int64 and float64, they are 8 bytes. But for strings, the length of the string is not fixed. So instead of save the bytes of strings in the ndarray directly, Pandas use object ndarray, which save pointers to objects, because of ...
What is the maximum length of data I can put in a BLOB column in MySQL?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Tool for generating railroad diagram used on json.org [closed]
...code's there to see. Then just embed in your document. I wrote a WP plugin based on this. - The hardest part is making the graphics look nice.
– Peter Ajtai
Mar 21 '12 at 16:31
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How to validate an email address using a regular expression?
...s. Or Comparing E-mail Address Validating Regular Expressions.
Debuggex Demo
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Perforce for Git users? [closed]
... Configure your connection to Perforce
export P4USER=matt
export P4CLIENT=demo-workspace
export P4PORT=perforce:1666
You can stick these settings in your shell config file, use p4 set to save them on Windows and OS X, or use a Perforce config file.
1) Create a workspace
p4 workspace
# set your...
C dynamically growing array
... 3/2 gives you 50% worst and 25% typical. It's also close to the effective base of the Fibionacci sequence in the limit (phi) which is often praised and used for its "exponential but much less violently than base-2" characteristics, but easier to calculate. The +8 means that arrays which are reasona...
Maximum length of HTTP GET request
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Chrome 32779 >64k
Android 8192 >64k
Firefox >64k >64k
Safari >64k >64k
Internet Explorer 11 2047 5120
Edge 16 2047 ...
What is the optimal algorithm for the game 2048?
... well.
Since the game is a discrete state space, perfect information, turn-based game like chess and checkers, I used the same methods that have been proven to work on those games, namely minimax search with alpha-beta pruning. Since there is already a lot of info on that algorithm out there, I'll j...
What is the most efficient string concatenation method in python?
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64
''.join(sequenceofstrings) is what usually works best -- simplest and fastest.
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Why is there no std::stou?
...+11 21.5/1: Effects: the first two functions call strtol(str.c_str(), ptr, base), and the last three functions call strtoul(str.c_str(), ptr, base), strtoll(str.c_str(), ptr, base), and strtoull(str.c_str(), ptr, base), respectively.
– Mike Seymour
Jan 3 '12 at...