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How do I pass a string into subprocess.Popen (using the stdin argument)?
...current Python 3 version, you could use subprocess.run, to pass input as a string to an external command and get its exit status, and its output as a string back in one call:
#!/usr/bin/env python3
from subprocess import run, PIPE
p = run(['grep', 'f'], stdout=PIPE,
input='one\ntwo\nthree\...
Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...
The Big Picture
There are two issues at play here:
Integer getInteger(String) doesn't do what you think it does
It returns null in this case
the assignment from Integer to int causes auto-unboxing
Since the Integer is null, NullPointerException is thrown
To parse (String) "123" to (int)...
Non-type template parameters
...
That is not allowed.
However, this is allowed:
template <std::string * temp> //pointer to object
void f();
template <std::string & temp> //reference to object
void g();
See §14.1/6,7,8 in C++ Standard (2003).
Illustration:
template <std::string * temp> //point...
How many constructor arguments is too many?
...e fluent interface in action would be:
public class CustomerBuilder {
String surname;
String firstName;
String ssn;
public static CustomerBuilder customer() {
return new CustomerBuilder();
}
public CustomerBuilder withSurname(String surname) {
this.surname = ...
What are the true benefits of ExpandoObject?
...le, imagine that you have a dictionary within a dictionary:
Dictionary<String, object> dict = new Dictionary<string, object>();
Dictionary<String, object> address = new Dictionary<string,object>();
dict["Address"] = address;
address["State"] = "WA";
Console.WriteLine(((Dicti...
Google Guava isNullOrEmpty for collections
I see that Guava has isNullOrEmpty utility method for Strings
7 Answers
7
...
How to add parameters to a HTTP GET request in Android?
...
I use a List of NameValuePair and URLEncodedUtils to create the url string I want.
protected String addLocationToUrl(String url){
if(!url.endsWith("?"))
url += "?";
List<NameValuePair> params = new LinkedList<NameValuePair>();
if (lat != 0.0 && lon !...
ASP.NET MVC 4 Custom Authorize Attribute with Permission Codes (without roles)
...rizeUserAttribute : AuthorizeAttribute
{
// Custom property
public string AccessLevel { get; set; }
protected override bool AuthorizeCore(HttpContextBase httpContext)
{
var isAuthorized = base.AuthorizeCore(httpContext);
if (!isAuthorized)
{
...
How to replace list item in best way
...he index in the List and use this index to replace the list item.
List<string> listOfStrings = new List<string> {"abc", "123", "ghi"};
listOfStrings[listOfStrings.FindIndex(ind=>ind.Equals("123"))] = "def";
...
Getting an element from a Set
...you have no other option but to use the iterator:
public static void main(String[] args) {
Set<Foo> set = new HashSet<Foo>();
set.add(new Foo("Hello"));
for (Iterator<Foo> it = set.iterator(); it.hasNext(); ) {
Foo f = it.next();
if (f.equals(new Foo(...