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Seeing escape characters when pressing the arrow keys in python shell
...o move around in the current line or get previous commands (with arrow-up) etc.
23 Answers
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
I have a data frame df and I use several columns from it to groupby :
7 Answers
7
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Is there any good dynamic SQL builder library in Java? [closed]
... a simpler API and supports also other backends (JPA, JDO, Lucene, Mongodb etc.); I am also in the company behind Querydsl
– Timo Westkämper
Apr 12 '11 at 5:55
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Getting root permissions on a file inside of vi? [closed]
...eed to add your user to sudoer file first, enter the root user, and open /etc/sudoers file, add your_username ALL=(ALL) ALL under the line root ALL=(ALL) ALL, quit and save.
– coolesting
Oct 25 '11 at 3:18
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Can someone explain this 'double negative' trick? [duplicate]
...single operand can be converted to true; otherwise, returns true.
So if getContext gives you a "falsey" value, the !! will make it return the boolean value false. Otherwise it will return true.
The "falsey" values are:
false
NaN
undefined
null
"" (empty string)
0
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How to secure MongoDB with username and password
...at starts with #auth=true in your mongod configuration file (default path /etc/mongo.conf). This will enable authentication for mongodb.
Then, restart mongodb : sudo service mongod restart
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C/C++ include header file order
...ers from other non-standard, non-system libraries (for example, Qt, Eigen, etc).
Headers from other "almost-standard" libraries (for example, Boost)
Standard C++ headers (for example, iostream, functional, etc.)
Standard C headers (for example, cstdint, dirent.h, etc.)
If any of the headers have a...
General guidelines to avoid memory leaks in C++ [closed]
...ption safety and resource disposal in C++, and no other pattern (sandwich, etc.) will give you both (and most of the time, it will give you none).
See below a comparison of RAII and non RAII code:
void doSandwich()
{
T * p = new T() ;
// do something with p
delete p ; // leak if the p pro...
How to list the contents of a package using YUM?
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rpm -ql [packageName]
Example
# rpm -ql php-fpm
/etc/php-fpm.conf
/etc/php-fpm.d
/etc/php-fpm.d/www.conf
/etc/sysconfig/php-fpm
...
/run/php-fpm
/usr/lib/systemd/system/php-fpm.service
/usr/sbin/php-fpm
/usr/share/doc/php-fpm-5.6.0
/usr/share/man/man8/php-fpm.8.gz
...
/var/...
Include headers when using SELECT INTO OUTFILE?
...nd also matt's answer for a way to quickly get all the ColName1, ColName2, etc. Very useful add-ons to this great answer!
– Andrew T
Oct 5 '15 at 1:11
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