大约有 6,261 项符合查询结果（耗时：0.0166秒） [XML]
How to delete a file or folder?
...ling.
EXAMPLE for os.path.isfile
#!/usr/bin/python
import os
myfile="/tmp/foo.txt"
## If file exists, delete it ##
if os.path.isfile(myfile):
os.remove(myfile)
else: ## Show an error ##
print("Error: %s file not found" % myfile)
###Exception Handling
#!/usr/bin/python
import os
## Get...
Should a function have only one return statement?
...d to return for "easy" situations. For example, this:
public void DoStuff(Foo foo)
{
if (foo != null)
{
...
}
}
... can be made more readable (IMHO) like this:
public void DoStuff(Foo foo)
{
if (foo == null) return;
...
}
So yes, I think it's fine to have multiple ...
Where can I learn how to write C code to speed up slow R functions? [closed]
...examples. This function creates a character vector using the C API:
SEXP foobar(){
SEXP ab;
PROTECT(ab = allocVector(STRSXP, 2));
SET_STRING_ELT( ab, 0, mkChar("foo") );
SET_STRING_ELT( ab, 1, mkChar("bar") );
UNPROTECT(1);
}
Using Rcpp, you can write the same function as:
SEXP fooba...
Why does Ruby have both private and protected methods?
...in):005:2> end
irb(main):006:1> end
=> nil
irb(main):007:0> foo = A.new
=> #<A:0x31688f>
irb(main):009:0> foo.send :not_so_private_method
Hello World
=> nil
share
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i...
Return array in a function
...ntax to achieve it is by using a typedef: typedef int array[5]; array& foo(); But you don't even need the typedef if you care to write this: int (&foo())[5] { static int a[5] = {}; return a; }, the example in the question would be: int (&foo( int (&a)[5] ))[5] { return a; }. Simple, ...
Is there a function to make a copy of a PHP array to another?
...ts are assigned by reference. This means that:
$a = array();
$b = $a;
$b['foo'] = 42;
var_dump($a);
Will yield:
array(0) {
}
Whereas:
$a = new StdClass();
$b = $a;
$b->foo = 42;
var_dump($a);
Yields:
object(stdClass)#1 (1) {
["foo"]=>
int(42)
}
You could get confused by intrica...
How to view the assembly behind the code using Visual C++?
...
//boost::filesystem::path dir = p.parent_path();
// transform c:\foo\bar\1234\a.exe
// into c:\foo\bar\1234\1234.asm
p.remove_filename();
system ( (dircmd + p.string()).c_str() );
auto subdir = p.end(); // pointing at one-past the end
subdir--; ...
Why does dividing two int not yield the right value when assigned to double?
...swered Sep 27 '11 at 15:04
Fred FooFred Foo
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...
How to add double quotes to a string that is inside a variable?
... /// <param name="value">Value to be put between double quotes ex: foo</param>
/// <returns>double quoted string ex: "foo"</returns>
public static string AddDoubleQuotes(this string value)
{
return "\"" + value + "\"";
}
Then you may call foo.AddDo...
Javascript how to split newline
...examples that display the importance of this method:
var examples = ["Foo\r\nBar", "Foo\r\n\r\nBar", "Foo\n\r\n\rBar", "Foo\nBar\nFooBar"];
examples.forEach(function(example) {
output(`Example "${example}":`);
output(`Split using "\n": "${example.split("\n")}"`);
output(`Split using...