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Argparse: Required arguments listed under “optional arguments”?
I use the following simple code to parse some arguments; note that one of them is required. Unfortunately, when the user runs the script without providing the argument, the displayed usage/help text does not indicate that there is a non-optional argument, which I find very confusing. How can I get p...
What exactly does an #if 0 … #endif block do?
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It's identical to commenting out the block, except with one important difference: Nesting is not a problem. Consider this code:
foo();
bar(x, y); /* x must not be NULL */
baz();
If I want to comment it out, I might try:
/*
foo();
bar(x, y); /* x must not be NULL */
baz();
*/
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Command not found when using sudo
...WRITE and EXECUTE permissions for the file owner, the group owner and everyone else who is not the file owner or a member of the group to which the file belongs (that last permission group is sometimes referred to as "world" or "other")
Here's a summary of how to troubleshoot the Permission Denied ...
When should the volatile keyword be used in C#?
Can anyone provide a good explanation of the volatile keyword in C#? Which problems does it solve and which it doesn't? In which cases will it save me the use of locking?
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How to get the process ID to kill a nohup process?
...st column you find your user name; I found it the following three times:
One was the SSH connection
The second was an FTP connection
The last one was the nohup process
Then in the second column you can find the PID of the nohup process and you only type:
kill PID
(replacing the PID with the ...
jQuery.ajax handling continue responses: “success:” vs “.done”?
...ys to 'continue' the script once the call has been made: success: and .done .
3 Answers
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Difference between outline and border
...CSS standard, and is not supported by other browsers (source))
2) Styling one side only
border has properties to style each side with border-top:, border-left: etc.
outline can't do this. There's no outline-top: etc. It's all or nothing. (see this SO post)
3) offset
outline supports offset wi...
What are “connecting characters” in Java identifiers?
...tart() which states A character may start a Java identifier if and only if one of the following conditions is true: ... ch is a currency symbol (such as "$"); ch is a connecting punctuation character (such as "_").
– user
Aug 2 '12 at 9:53
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Using backticks around field names
...e alternative characters. In query writing it's not such a problem, but if one assumes you can just use backticks, I would assume it lets you get away with ridiculous stuff like
SELECT `id`, `my name`, `another field` , `field,with,comma`
Which does of course generate badly named tables.
If yo...
Programmatic equivalent of default(Type)
...n the type and set the default(Type) explicitly, but I'd rather do it in one line. Is there a programmatic equivalent of default?
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