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How to “test” NoneType in python?
...m the horse's mouth
Quoting Python's Coding Style Guidelines - PEP-008 (jointly defined by Guido himself),
Comparisons to singletons like None should always be done with is or is not, never the equality operators.
shar...
How to specify a min but no max decimal using the range data annotation attribute?
...
I've used it for Int32 (Int32.MaxValue) and it is ok, thanks!
– Bronek
May 8 '13 at 19:24
16
...
node.js execute system command synchronously
...FI = require("node-ffi");
var libc = new FFI.Library(null, {
"system": ["int32", ["string"]]
});
var run = libc.system;
run("echo $USER");
[EDIT Jun 2012: How to get STDOUT]
var lib = ffi.Library(null, {
// FILE* popen(char* cmd, char* mode);
popen: ['pointer', ['string', 'string']],
...
Separate Back Stack for each tab in Android using Fragments
...in the framework. For an example try paying attention to how the back key interacts with the standard browser in the various ways you can go in and out of it. (Each "window" in the browser is essentially a tab.)
share
...
Precision String Format Specifier In Swift
...ion so far, following from David's response:
import Foundation
extension Int {
func format(f: String) -> String {
return String(format: "%\(f)d", self)
}
}
extension Double {
func format(f: String) -> String {
return String(format: "%\(f)f", self)
}
}
let so...
Do I need quotes for strings in YAML?
...s values
I, however, use double-quotes for integer values that need to be converted to strings like:
docker-compose version like version: "3.8"
port numbers like "8080:8080"
However, for special cases like booleans, floats, integers, and other cases, where using double-quotes for the entry values...
How to create a file in Android?
How to create a file, write data into it and read data from it on Android? If possible provide a code snippet.
4 Answers
...
Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?
...getting this error by saving an object to the shared preferences as a gson converted string. The gson String was no good, so retrieving and deserializing the object was not actually working correctly. This meant any subsequent accesses to the object resulted in this error. Scary :)
...
Get spinner selected items text?
...public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
Toast.makeText(parent.getContext()), "The planet is " +
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView parent) {
...
The object cannot be deleted because it was not found in the ObjectStateManager
... propergate on Kjartans explanation:
I had:
public Project DeleteProject(int id)
{
using (var context = new Context())
{
var p = GetProject(id);
context.Projects.Remove(p);
context.SaveChanges();
return p;
}
}
The pr...