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Does Parallel.ForEach limit the number of active threads?
...ntBag<int> monitorOut = new ConcurrentBag<int>();
var arrayStrings = new string[1000];
Parallel.ForEach<string>(arrayStrings, someString =>
{
monitor.Add(monitor.Count);
monitor.TryTake(out int result);
monitorOut.Add(result);
});
Con...
Optimal way to concatenate/aggregate strings
I'm finding a way to aggregate strings from different rows into a single row. I'm looking to do this in many different places, so having a function to facilitate this would be nice. I've tried solutions using COALESCE and FOR XML , but they just don't cut it for me.
...
Programmatically saving image to Django ImageField
...import File # you need this somewhere
import urllib
# The following actually resides in a method of my model
result = urllib.urlretrieve(image_url) # image_url is a URL to an image
# self.photo is the ImageField
self.photo.save(
os.path.basename(self.url),
File(open(result[0], 'rb'))
...
Why does isNaN(“ ”) (string with spaces) equal false?
...
JavaScript interprets an empty string as a 0, which then fails the isNAN test. You can use parseInt on the string first which won't convert the empty string to 0. The result should then fail isNAN.
...
How do you set the Content-Type header for an HttpClient request?
...pRequestMessage(HttpMethod.Post, "relativeAddress");
request.Content = new StringContent("{\"name\":\"John Doe\",\"age\":33}",
Encoding.UTF8,
"application/json");//CONTENT-TYPE header
client.SendAsync(request)
.ContinueW...
Android 4.3 menu item showAsAction=“always” ignored
...">
<item android:id="@+id/menu_add_size"
android:title="@string/menu_add_item"
android:orderInCategory="10"
[yourapp]:showAsAction="always"
android:icon="@android:drawable/ic_menu_add" />
</menu>
Replace [yourapp] with your app name or any namespa...
Join a list of items with different types as string in Python
...
Calling str(...) is the Pythonic way to convert something to a string.
You might want to consider why you want a list of strings. You could instead keep it as a list of integers and only convert the integers to strings when you need to display them. For example, if you have a list of in...
Best way to initialize (empty) array in PHP
...ferent ways, with the literal grammar not being dogged by the overhead of calling a function.
PHP, on the other hand, has language constructs that may look like functions but aren't treated as such. Even with PHP 5.4, which supports [] as an alternative, there is no difference in overhead because...
How do I delete everything in Redis?
... one class there:
public class DataCleaner {
public static void main(String args[]) {
String keyPattern = args[0];
String host = args[1];
int port = Integer.valueOf(args[2]);
int dbIndex = Integer.valueOf(args[3]);
Jedis jedis = new Jedis(host, port);
...
Read a zipped file as a pandas DataFrame
... you want to read a zipped or a tar.gz file into pandas dataframe, the read_csv methods includes this particular implementation.
df = pd.read_csv('filename.zip')
Or the long form:
df = pd.read_csv('filename.zip', compression='zip', header=0, sep=',', quotechar='"')
Description of the compr...