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Python argparse command line flags without arguments
How do I add an optional flag to my command line args?
4 Answers
4
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Correctly determine if date string is a valid date in that format
I'm receiving a date string from an API, and it is formatted as yyyy-mm-dd .
16 Answers
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Default value of a type at Runtime [duplicate]
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There's really only two possibilities: null for reference types and new myType() for value types (which corresponds to 0 for int, float, etc) So you really only need to account for two cases:
object GetDefaultValue(Type t)
{
if (t.IsValueType)
return Activator.CreateInstance(...
Is there a way to hide the scroll indicators in a UIScrollView?
...e case where those indicators disturb the user interaction. Can I subclass and override a method or do something similar to remove the scroll indicators from the scroll view?
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How to determine an interface{} value's “real” type?
... v + " Yeah!" is possible.
fmt.Printf("String: %v", v)
default:
// And here I'm feeling dumb. ;)
fmt.Printf("I don't know, ask stackoverflow.")
}
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Avoiding instanceof in Java
...ng a chain of "instanceof" operations is considered a "code smell". The standard answer is "use polymorphism". How would I do it in this case?
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how to release localhost from Error: listen EADDRINUSE
i am testing a server written in nodejs on windows 7
and when i try to run the tester in the command line i get the following error
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What does “@private” mean in Objective-C?
... // We can access protectedLetter because it's protected
// and it is declared by a superclass; @protected variables
// are available to subclasses.
protectedLetter = 'z';
// We can't access privateBool because it's private;
// only methods of the clas...
How to add lines to end of file on Linux
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It depends on the last added line, not your current command. When you do the $ echo "foobar" >> file,the newline is already there. If you do $ echo -n "foobar" >> file, you won't append the newline to the end of the line, so you'll write in the same line.
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Can't use NVM from root (or sudo)
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The below list of commands (source: digitalocean) seems to fix the problem
n=$(which node); \
n=${n%/bin/node}; \
chmod -R 755 $n/bin/*; \
sudo cp -r $n/{bin,lib,share} /usr/local
The above command is a bit complicated, but all it's doing is co...