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Delete file from internal storage
...
String dir = getFilesDir().getAbsolutePath();
File f0 = new File(dir, "myFile");
boolean d0 = f0.delete();
Log.w("Delete Check", "File deleted: " + dir + "/myFile " + d0);
The code File dir = getFilesDir(); doesn't work be...
Pandas read_csv low_memory and dtype options
...s cannot know it is only numbers, it will probably keep it as the original strings until it has read the whole file.
Specifying dtypes (should always be done)
adding
dtype={'user_id': int}
to the pd.read_csv() call will make pandas know when it starts reading the file, that this is only integers.
A...
What is PECS (Producer Extends Consumer Super)?
... arguments in the subtype.
}
class Sub extends Super {
@Override
String testCoVariance(){ return null;} //compiles successfully i.e. return type is don't care(String is subtype of Object)
@Override
void testContraVariance(String parameter){} //doesn't support even though String is...
How can I remove a key and its value from an associative array?
...:
unset($arr["key2"]);
var_dump($arr);
// output: array(3) { ["key1"]=> string(6) "value1" ["key3"]=> string(6) "value3" ["key4"]=> string(6) "value4" }
To remove element by value:
// remove an element by value:
$arr = array_diff($arr, ["value1"]);
var_dump($arr);
// output: array(2) { ["...
What is the difference between NaN and None?
...dcsv() and then assigning the values to a dictionary. The columns contain strings of numbers and letters. Occasionally there are cases where a cell is empty. In my opinion, the value read to that dictionary entry should be None but instead nan is assigned. Surely None is more descriptive of a...
Warning the user/local/mysql/data directory is not owned by the mysql user
...ve</key>
<true />
<key>Label</key>
<string>com.mysql.mysqld</string>
<key>ProgramArguments</key>
<array>
<string>/usr/local/mysql/bin/mysqld_safe</string>
<string>--user=mysql</string>
&...
php发送get、post请求的几种方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...// if not given use this script as referrer
$referrer="111";
// making string from $data
foreach($data as $key=>$value)
$values[]="$key=".urlencode($value);
$data_string=implode("&",$values);
// Find out which port is needed - if not given use standard (=80)
if(!isset($URL_Info["port"]...
Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
...
@280Z28 So? A similar case is that their Boolean.ToString method apparently contains hardcoded strings inside its function, rather than returning the publicly exposed Boolean.TrueString and Boolean.FalseString. It's irrelevant; The point is, == does the same thing as Referenc...
catch exception that is thrown in different thread
...cess exception in some task's thread
class Program
{
static void Main(string[] args)
{
Task<int> task = new Task<int>(Test);
task.ContinueWith(ExceptionHandler, TaskContinuationOptions.OnlyOnFaulted);
task.Start();
Console.ReadLine();
}
s...
Unix command to prepend text to a file
Is there a Unix command to prepend some string data to a text file?
16 Answers
16
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