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Difference between object and class in Scala
...t O an instance of trait T; you can then pass O anywhere, a T is expected.
if there is a class C, then object C is the companion object of class C; note that the companion object is not automatically an instance of C.
Also see Scala documentation for object and class.
object as host of static mem...
Group by & count function in sqlalchemy
...
If you are using Table.query property:
from sqlalchemy import func
Table.query.with_entities(Table.column, func.count(Table.column)).group_by(Table.column).all()
If you are using session.query() method (as stated in miniwa...
Calling shell functions with xargs
... any error value that might be produced by the command preceding it. Also, if there's no error, it's the default and thus somewhat redundant.
@phobic mentions that the Bash command could be simplified to
bash -c 'echo_var "{}"'
moving the {} directly inside it. But it's vulnerable to command inj...
Where are environment variables stored in registry?
... is installed by default and supports connecting to other systems.
To modify a remote systems global environment variables you would use
setx /m /s HOSTNAME-GOES-HERE VariableNameGoesHere VariableValueGoesHere
This does not require restarting explorer.
...
Get path of executable
...os.html to select the method is straightforward.
– Clifford
Oct 7 '09 at 15:02
5
So is this what ...
How to perform better document version control on Excel files and SQL schema files
...mmit, Git will figure out everything for you, and you'll be able to see modification dates, checkout specific versions of this file and compare different versions.
The same is true for .xlsx if you decompress them. .xlsx files are zipped up directories of XML files (See How to properly assemble a v...
Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的文本即可：
tail -f /data/log/logstash/all.log | awk '{
if (match($0, /.*(PHP Deprecated|PHP Notice|PHP Fatal error|PHP Warning|ERROR|WARN).*/)) { print "\033[41;37;1m"$0"\033[0m" }
else if (match($0, /.*关键信息1.*/)) { print "\033[32;1m"$0"\033[0m" }
else if (match($0, /...
Fully backup a git repo?
...
@Daniel: If you clone a repository, you fetch every branch, but only the default one is checkouted. Try git branch -a. Maybe its more obvious this way: After cloning a repository you dont fetch every branch, you fetch every commit. Br...
How to display full (non-truncated) dataframe information in html when converting from pandas datafr
...ormation is truncated to 50 characters. Anything in excess is ellipsized:
If you set the display.max_colwidth option, the information will be displayed fully:
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Bash script processing limited number of commands in parallel
...manual:
wait [jobspec or pid ...]
Wait until the child process specified by each process ID pid or job specification jobspec exits and return the exit status of the last
command waited for. If a job spec is given, all processes in the job
are waited for. If no arguments are given, all cu...