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Efficient way to apply multiple filters to pandas DataFrame or Series
...es object. Essentially, I want to efficiently chain a bunch of filtering (comparison operations) together that are specified at run-time by the user.
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How to get number of rows using SqlDataReader in C#
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Thank you all! This is becoming more clear. So is it better to dump all the info to the DataSet or run through a SQL COUNT(*), store it and then run the required query? Or are we talking about running count and storing everything in the DataSet?
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What are the most-used vim commands/keypresses?
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Here's a tip sheet I wrote up once, with the commands I actually use regularly:
References
vim documentation online
advanced vim tips
more useful tips and graphical cheat sheet
General
Nearly all commands can be preceded by a number for a repeat count. eg. 5dd de...
MySQL Error 1153 - Got a packet bigger than 'max_allowed_packet' bytes
...nning and accepting the import.
For the client, you can specify it on the command line:
mysql --max_allowed_packet=100M -u root -p database < dump.sql
Also, change the my.cnf or my.ini file under the mysqld section and set:
max_allowed_packet=100M
or you could run these commands in a MySQL...
install / uninstall APKs programmatically (PackageManager vs Intents)
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How to simulate target=“_blank” in JavaScript
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<script>
window.open('http://www.example.com?ReportID=1', '_blank');
</script>
The second parameter is optional and is the name of the target window.
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how to change default python version?
... 3.2 in my mac. After I run /Applications/Python 3.2/Update Shell Profile.command , it's confusing that when I type python -V in Terminal it says that Python 2.6.1 , how can I change the default python version?
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Change all files and folders permissions of a directory to 644/755
...nge all files to 644 and all folders to 755 using chmod from the linux command prompt? (Terminal)
8 Answers
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Having both a Created and Last Updated timestamp columns in MySQL 4.0
... restriction has been lifted. Any TIMESTAMP column definition can have any combination of DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP clauses. In addition, these clauses now can be used with DATETIME column definitions. For more information, see Automatic Initialization and Updating fo...
How to run Nginx within a Docker container without halting?
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