大约有 6,261 项符合查询结果（耗时：0.0194秒） [XML]
ImportError: Cannot import name X
...r others. Note that if you're importing a local submodule (i.e. import app.foo.bar) you need to give it a name (i.e. import app.foo.bar as bar)
– data princess
Jul 28 at 21:48
...
Is there a standard way to list names of Python modules in a package?
... As a matter of fact, this only seems to work if I import my_package.foo and not just import mypackage, in which case it then returns foo. But this defeats the purpose
– Amelio Vazquez-Reina
Jun 26 '13 at 16:52
...
How to output MySQL query results in CSV format?
...to-a-text-or-csv-file/
SELECT order_id,product_name,qty
FROM orders
WHERE foo = 'bar'
INTO OUTFILE '/var/lib/mysql-files/orders.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';
Using this command columns names will not be exported.
Also note that /var/lib/mysql-files/order...
How to get UTF-8 working in Java webapps?
...ires that we define a character set filter like the following:
package fi.foo.filters;
import javax.servlet.*;
import java.io.IOException;
public class CharsetFilter implements Filter {
private String encoding;
public void init(FilterConfig config) throws ServletException {
enco...
Is the ternary operator faster than an “if” condition in Java [duplicate]
... to use the ternary operator. If you don't have an assignment:
(i == 0) ? foo () : bar ();
an if/else isn't that much more code:
if (i == 0) foo (); else bar ();
In performance critical cases: measure it. Measure it with the target machine, the target JVM, with typical data, if there is a bot...
Removing item from vector, while in C++11 range 'for' loop?
...y using:
for (MyVector::iterator b = v.begin(); b != v.end();) {
if (foo) {
b = v.erase( b ); // reseat iterator to a valid value post-erase
else {
++b;
}
}
Note, that you need the b != v.end() test as-is. If you try to optimize it as follows:
for (MyVector::iterator b...
Adding multiple class using ng-class
...lt;div ng-class="[class1, class2]"></div>
Usage:
<div class="foo bar" class1="foo" class2="bar"></div>
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Share variables between files in Node.js?
...just want to export your "name" variable. E.g.,
// module.js
var name = "foobar";
// export it
exports.name = name;
Then, in main.js...
//main.js
// get a reference to your required module
var myModule = require('./module');
// name is a member of myModule due to the export above
var name = my...
jQuery pitfalls to avoid [closed]
... due to the fact that in older versions of jquery, it was faster to do $('#foo') rather than $('div#foo'), since by definition, an id is unique. I'm pretty sure this was fixed in later releases however, but that recommendation applied only to ids, not other types of selectors
–...
Can I write a CSS selector selecting elements NOT having a certain class or attribute?
...ritten. For
instance :not(*|*), which represents no element at all, or
foo:not(bar), which is equivalent to foo but with a higher
specificity.
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