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“Cloning” row or column vectors
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Here's an elegant, Pythonic way to do it:
>>> array([[1,2,3],]*3)
array([[1, 2, 3],
[1, 2, 3],
[1, 2, 3]])
>>> array([[1,2,3],]*3).transpose()
array([[1, 1, 1],
[2, 2, 2],
[3, 3, 3]])
the proble...
How to check sbt version?
... Why does sbt sbtVersion run outside a project take 9 seconds to run? Python, node and ruby all take under a second, as do awk, sed, minibloom and a bunch of other command line tools. gcc takes one whole second, which is super-slow. But 9 seconds takes the cherry. What is sbt doing in that ...
Delete column from SQLite table
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I've made a Python function where you enter the table and column to remove as arguments:
def removeColumn(table, column):
columns = []
for row in c.execute('PRAGMA table_info(' + table + ')'):
columns.append(row[1])
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SQL, Postgres OIDs, What are they and why are they useful?
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To remove all OIDs from your database tables, you can use this Linux script:
First, login as PostgreSQL superuser:
sudo su postgres
Now run this script, changing YOUR_DATABASE_NAME with you database name:
for tbl in `psql -qAt -c "select schemaname || '.' || tablename from pg_tables...
How do I copy directories recursively with gulp?
...y option at the end is to suppress the overwrite confirmation message.
In Linux, you can execute the following command from gulp:
cp -R /path/to/srcfolder /path/to/destfolder
you can use gulp-exec or gulp-run plugin to execute system commands from gulp.
Related Links:
xcopy usage
gulp-exec an...
Running script upon login mac [closed]
...e job for the launchd solution - see trisweb's answer. If you can manage a python daemon, youre sure can manage an plist config file where you can manage all aspects of restarts and so on...
– jm666
Aug 11 '14 at 15:29
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Error: could not find function … in R
...ommand-line. Unlike my R which is installed from Fedora repository into my Linux system, I have downloaded my "celestial" package in a different directory in my "home". Each time I am requesting the function "cosvol()", it says, "could not find function "cosdistCoVol"." I am not sure how to let R kn...
Vim and Ctags tips and tricks [closed]
...t_id=1764
taglist.vim : Source code browser (supports C/C++, java, perl, python, tcl, sql, php, etc)
http://www.vim.org/scripts/script.php?script_id=273
share
edited Jun...
Postgres: INSERT if does not exist already
I'm using Python to write to a postgres database:
17 Answers
17
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How to use “not” in xpath?
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None of these answers worked for me for python. I solved by this
a[not(@id='XX')]
Also you can use or condition in your xpath by | operator. Such as
a[not(@id='XX')]|a[not(@class='YY')]
Sometimes we want element which has no class. So you can do like
a[not(@...