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In Python how should I test if a variable is None, True or False
...simulate(open("myfile"))
except SimulationException as sim_exc:
print "error parsing stream", sim_exc
else:
if result:
print "result pass"
else:
print "result fail"
# execution continues from here, regardless of exception or not
And now you can have a much richer type ...
Why can I change value of a constant in javascript
... // ['foo2']
but neither of these:
const x = {};
x = {foo: 'bar'}; // error - re-assigning
const y = ['foo'];
const y = ['bar']; // error - re-declaring
const foo = 'bar';
foo = 'bar2'; // error - can not re-assign
var foo = 'bar3'; // error - already declared
function foo() {}; // ...
What causes javac to issue the “uses unchecked or unsafe operations” warning
... Just to point out, this is not collections specific. You get the error because Java compiler can't ensure type safety in general. For example, same warning is produced with the following code: AbstractMap.SimpleEntry<String, String> entry = new AbstractMap.SimpleEntry("hello", "world...
jQuery Validate Plugin - Trigger validation of single field
...
This solution validate the whole form, showing the error messages for all fields.
– Pablo
Apr 21 '15 at 13:21
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npm throws error without sudo
...ever I try to search or install something with npm it throws the following error, unless I sudo the command. I have a feeling this is a permissions issue? I am already the admin.
...
Why does Google prepend while(1); to their JSON responses?
...t without any processing, resulting in either an infinite loop or a syntax error.
This does not address the issue of cross-site request forgery.
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HTML5 form required attribute. Set custom validation message?
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I tried this but there is still an error. If you leave the field empty it shows the message, then enter something in the field but it now shows an empty message and the action isn't executed. If you now click the button again, it will go through.
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Entity Framework: “Store update, insert, or delete statement affected an unexpected number of rows (
...populate a grid control. Sometimes when I make updates I get the following error:
45 Answers
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What scalability problems have you encountered using a NoSQL data store? [closed]
...ded database for I now use Redis. e.g. To get a real-time combined rolling error log for all our services (which has notoriously been a hard task for us), is now accomplished with only a couple of lines by just pre-pending the error to a Redis server side list and then trimming the list so only the ...
Are braces necessary in one-line statements in JavaScript?
...ice to always use the braces {}. As @Arx said, there's a lot more room for error if you leave them out. Apple even had a bug in iOS's SSL/TLS because they didn't use braces
– Keenan Lidral-Porter
Jan 6 '15 at 19:56
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