大约有 3,300 项符合查询结果（耗时：0.0139秒） [XML]
Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
...
Python 2.5.1
$ cat my_script.py
#!/usr/bin/env python
import json
print "hello, json"
$ PATH=/usr/local/bin:/usr/bin
$ ./my_script.py
hello, json
$ PATH=/usr/bin:/usr/local/bin
$ ./my_script.py
Traceback (most recent call last):
File "./my_script.py", line 2, in <module>
import json
...
Best practices/performance: mixing StringBuilder.append with String.concat
...
The compilier optimize the + concatenation.
So
int a = 1;
String s = "Hello " + a;
is transformed into
new StringBuilder().append("Hello ").append(1).toString();
There an excellent topic here explaining why you should use the + operator.
...
What are the differences between Rust's `String` and `str`?
... copy the literal string into the String managed memory:
let a: String = "hello rust".into();
The following code lets you use the literal itself without copy (read only though)
let a: &str = "hello rust";
share
...
Ruby: kind_of? vs. instance_of? vs. is_a?
...he object is an instance of that exact class, not a subclass.
Example:
"hello".is_a? Object and "hello".kind_of? Object return true because "hello" is a String and String is a subclass of Object.
However "hello".instance_of? Object returns false.
...
How to urlencode a querystring in Python?
... : "True != False",
"alpha" : "http://www.example.com",
"charlie" : "hello world",
"delta" : "1234567 !@#$%^&*",
"echo" : "user@example.com",
}
### ********************
## setup an exact ordering for the name-value pairs
ary_ordered_names = []
ary_ordered_names.append('alpha')
...
How to wrap async function calls into a sync function in Node.js or Javascript?
...nticipatedSyncFunction(){
var ret;
setTimeout(function(){
ret = "hello";
},3000);
while(ret === undefined) {
require('deasync').runLoopOnce();
}
return ret;
}
var output = AnticipatedSyncFunction();
//expected: output=hello (after waiting for 3 sec)
console.log("output="+...
a href link for entire div in HTML/CSS
...ing scenarios:
<a href="http://google.com">
<div>
Hello world
</div>
</a>
which is semantically incorrect, but it will work.
<div style="cursor: pointer;" onclick="window.location='http://google.com';">
Hello world
</div>
which is semanti...
Detecting request type in PHP (GET, POST, PUT or DELETE)
...ow). Use this for REST calls, e.g. http://example.com/test.php/testing/123/hello. This works with Apache and Lighttpd out of the box, and no rewrite rules are needed.
<?php
$method = $_SERVER['REQUEST_METHOD'];
$request = explode("/", substr(@$_SERVER['PATH_INFO'], 1));
switch ($method) {
cas...
Forced naming of parameters in Python
...default='hi')
1 hi default
>>> f(1, no_default='hi', has_default='hello')
1 hi hello
>>> f(1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: f() missing 1 required keyword-only argument: 'no_default'
>>> f(1, no_default=1, w...
CSS text-transform capitalize on all caps
...k::first-line {
text-transform: capitalize;
}
<div class="link">HELLO WORLD!</div>
<p class="link">HELLO WORLD!</p>
<a href="#" class="link">HELLO WORLD! ( now working! )</a>
Although this is limited to the first line it may be useful for more use c...