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PostgreSQL error: Fatal: role “username” does not exist
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edited Jun 6 at 22:57
answered Aug 12 '12 at 4:13
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Batch script: how to check for admin rights
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27 Answers
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How to make type=“number” to positive numbers only
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edited Aug 27 '19 at 7:44
Álvaro González
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Why would I use a templating engine? jsp include and jstl vs tiles, freemarker, velocity, sitemesh
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answered Jul 2 '10 at 20:18
matt bmatt b
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How do you do a simple “chmod +x” from within python?
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201
Use os.stat() to get the current permissions, use | to or the bits together, and use os.chmod(...
Creating a new column based on if-elif-else condition
... passing in the axis=1 option:
In [1]: df['C'] = df.apply(f, axis=1)
In [2]: df
Out[2]:
A B C
a 2 2 0
b 3 1 1
c 1 3 -1
Of course, this is not vectorized so performance may not be as good when scaled to a large number of records. Still, I think it is much more readable. Especially c...
Stack smashing detected
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edited Oct 25 '15 at 0:11
Demi
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How to change Android Studio's editor font?
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142
All you have to do is click the "Save As" button to create a new profile. You can't change the f...
How can I ensure that a division of integers is always rounded up?
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UPDATE: This question was the subject of my blog in January 2013. Thanks for the great question!
Getting integer arithmetic correct is hard. As has been demonstrated amply thus far, the moment you try to do a "clever" trick, odds are good that you've made a mistake. And when a fla...
LaTeX Optional Arguments
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Example from the guide:
\newcommand{\example}[2][YYY]{Mandatory arg: #2;
Optional arg: #1.}
This defines \example to be a command with two arguments,
referred to as #1 and #2 in the {<definition>}--nothing new so far.
But by addi...