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Inherit from a generic base class, apply a constraint, and implement an interface in C#
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public class KeyAndValue<T>
{
public string Key { get; set; }
public virtual T Value { get; set; }
}
public class KeyAndValue : KeyAndValue<string>
{
public override string Value { get; set; }
}
This is an extension off the existing answers. It ...
How to print to stderr in Python?
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Advantage of the print statement is easy printing of non-string values, without having to convert them first. If you need a print statement, I would therefore recommend using the 3rd option to be python 3 ready
– vdboor
Apr 6 '12 at 11:22
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Making a request to a RESTful API using python
...ld take optional "params" parameter which is usually a dict carrying query string. If a payload is necessary to fetch data (such as the example posted in question), then "requests.post" needs to be used. Additionally using "json" library makes it easier to parse json response.
–...
How to remove trailing whitespaces with sed?
...syntax on OSX:
sed -i '' -E 's/[ '$'\t'']+$//' "$1"
Three single-quoted strings ultimately become concatenated into a single argument/expression. There is no concatenation operator in bash, you just place strings one after the other with no space in between.
The $'\t' resolves as a literal tab-c...
How can I reverse a list in Python?
...tr (depending on what you're slicing). @Einar Petersen that is reversing a string, so the output is correct. Try: co2=['ae','ad','ac','ab','aa','z','y','x','w','v','u','t','s','r','q','p','o','n','m','l','k','j','i','h','g','f','e','d','c','b','a'] >>> co2[::-1]
– Aaro...
How do you display JavaScript datetime in 12 hour AM/PM format?
...Balz If minutes is less than 10 (e.g. 16:04), then that statement adds the string "0" so that the formatted output is "4:04 PM" instead of "4:4 PM". Note that in the process, minutes changes from a Number to a String.
– Caleb Bell
Jun 29 '13 at 21:05
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How to drop columns using Rails migration
...ill be created: rails g migration RemoveUnusefulFieldsFromUsers hair_color:string favorite_number:integer removes two attributes using a single migration. Note also that remove_column is not supported by change method, so you have to write both up and down.
– Claudio Floreani
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How is std::function implemented?
...;
}
};
// examples
int main()
{
int i = 0;
auto fn = [i](std::string const& s) mutable
{
std::cout << ++i << ". " << s << std::endl;
};
fn("first"); // 1. first
fn("second"); ...
How can I check if an argument is defined when starting/calling a batch file?
...guments.
⍟ exist on file system (either file or directory?) or a generic string.
⍟ specify if is a file
⍟ specify is a directory
⍟ no extensions, would work in legacy scripts!
⍟ minimal code ☺
@echo off
:loop
::-------------------------- has argument ?
if ["%~1"]==[""] (
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What is the difference between Python's list methods append and extend?
...st.
my_list.append(object)
Whatever the object is, whether a number, a string, another list, or something else, it gets added onto the end of my_list as a single entry on the list.
>>> my_list
['foo', 'bar']
>>> my_list.append('baz')
>>> my_list
['foo', 'bar', 'baz']...