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How to check whether a pandas DataFrame is empty?
... @Quant - The documentation has a discussion on why bool raises an error for a dataframe here: link. Quote: "Should it be True because it’s not zero-length? False because there are False values? It is unclear, so instead, pandas raises a ValueError"
– Bij
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E731 do not assign a lambda expression, use a def
...ile. One might say "f" whereas the other says "lambda". Maybe the lambda error is easier to scan because it's not a single-character function name, or a poorly-named long name?
– g33kz0r
Feb 17 '15 at 19:08
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What is Autoloading; How do you use spl_autoload, __autoload and spl_autoload_register?
...nless I have a class which extends another class (parent). PHP then throws error that it cannot find that parent class, even they're all in the same directory/namespace! What is confusing is that literally only first level classes are found, so I had to put another spl_autoload_register() with anony...
Is there a way to cache GitHub credentials for pushing commits?
...trc does not work outside of a git repository. It fails with the following error:
fatal: Not a git repository: . at /usr/share/perl5/Git.pm line 214.
There is no real reason why need to be within a repository, though. Credential helpers should be able to work just fine outside the repository ...
When to use symbols instead of strings in Ruby?
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@andrewcockerham Your provided link is not working (Error-404). You have to remove last / (after strings ) from the link. Here it is: www.reactive.io/tips/2009/01/11/the-difference-between-ruby-symbols-and-strings
– Atul Khanduri
Oc...
Why can templates only be implemented in the header file?
...iations are referred to from other .cpp files, and I still get the linking error that the members are not found.
– oarfish
Sep 4 '19 at 14:38
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Expand Python Search Path to Other Source
...(for a module called report.py):
from modules.report import report, reportError
If I call my main script, this works. HOWEVER, I wanted to test each module by including a main() in each, and calling each directly, as:
python modules/report.py
Now Python complains that it can't find "a module ...
How to deploy correctly when using Composer's develop / production switch?
...u to run composer install --no-dev in production, as composer install will error. Technically I think you're right; this isn't required, but it is an extra level of safety, which I like.
– dave1010
Feb 20 '14 at 10:23
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CSS triangle custom border color
...sible and invalid characters into my CSS file that caused validation/parse errors in that css file. Once I removed the invisible characters (the chars were zero width, so cursor wasn't showing them, but I was able to backspace) it worked wonderfully. It was not your code that was the problem, I thi...
Javascript when to use prototypes
...alert("B");
};
myObject.getB(); // This works fine
myObject.getA(); // Error!
var myPrototypeCopy = new myObject();
myPrototypeCopy.getA(); // This works, too.
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