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How to check if a column exists in Pandas
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What are the differences between various threading synchronization options in C#?
...code. Other threads must wait till the current owner relinquishes the lock by exiting the block of code. Also it is recommended that you lock on a private member object of your class.
Monitors
lock(obj) is implemented internally using a Monitor. You should prefer lock(obj) because it prevents y...
CSS content generation before or after 'input' elements [duplicate]
... specify which content should be inserted before (or after) the content inside of that element. input elements have no content.
E.g. if you write <input type="text">Test</input> (which is wrong) the browser will correct this and put the text after the input element.
The only thing you ...
Open an IO stream from a local file or url
...
open-uri is part of the standard Ruby library, and it will redefine the behavior of open so that you can open a url, as well as a local file. It returns a File object, so you should be able to call methods like read and readlines.
require 'open-uri'
file_con...
Changing case in Vim
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Selectors in Objective-C?
...tifier that replaces the name when the source code is compiled. A selector by itself doesn’t do anything. It simply identifies a method. The only thing that makes the selector method name different from a plain string is that the compiler makes sure that selectors are unique. What makes a selector...
System.Net.WebException HTTP status code
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By using the null-conditional operator (?.) you can get the HTTP status code with a single line of code:
HttpStatusCode? status = (ex.Response as HttpWebResponse)?.StatusCode;
The variable status will contain the HttpStat...
Finding row index containing maximum value using R
...tween rank and order. order returns the index each element has, but sorted by the elements' value. rank returns the index each element would have, if the list were sorted first. Thus order returns current index values; and be used as an "indexer" in pandas terms.
– The Red Pea
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Are default enum values in C the same for all compilers?
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and, this identical behavior is required by both C and C++. In C++, it's [dcl.enum]: "If the first enumerator has no initializer, the value of the corresponding constant is zero. An enumerator-definition without an initializer gives the enumerator the value obtai...
How to disable editing of elements in combobox for c#?
... it look 3D and sometimes its just plain ugly.
You can prevent user input by handling the KeyPress event of the ComboBox like this.
private void ComboBox1_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = true;
}
...