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Difference between __str__ and __repr__?
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__repr__: representation of python object usually eval will convert it back to that object
__str__: is whatever you think is that object in text form
e.g.
>>> s="""w'o"w"""
>>> repr(s)
'\'w\\\'o"w\''
>>> str(s)
'w\'o"w'
>>> eval(str(s))==s
Traceb...
What specific productivity gains do Vim/Emacs provide over GUI text editors?
...m gives you very specific and foolproof ways of setting file encodings and converting between them. The very first thing that impressed me about Vim is how perfectly it handles tab/space indentation options and Unix/DOS linebreaks compared to other editors that I had problems with at the time.
Man...
How to call function of one php file from another php file and pass parameters to it?
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Yes include the first file into the second. That's all.
See an example below,
File1.php :
<?php
function first($int, $string){ //function parameters, two variables.
return $string; //returns the second argument passed into the function
}...
Inserting data into a temporary table
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INSERT INTO #TempTable (ID, Date, Name)
SELECT id, date, name
FROM physical_table
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Mimicking sets in JavaScript?
...ray of all keys in the Set
// returns the original key (not the string converted form)
keys: function() {
var results = [];
this.each(function(data) {
results.push(data);
});
return results;
},
// clears the Set
clear: function() {
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How do I use CREATE OR REPLACE?
...y):
create or replace procedure NG_DROP_TABLE(tableName varchar2)
is
c int;
begin
select count(*) into c from user_tables where table_name = upper(tableName);
if c = 1 then
execute immediate 'drop table '||tableName;
end if;
end;
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What does CultureInfo.InvariantCulture mean?
...ates and decimal / currency values.
This will matter for you when you are converting input values (read) that are stored as strings to DateTime, float, double or decimal. It will also matter if you try to format the aforementioned data types to strings (write) for display or storage.
If you know...
What's the common practice for enums in Python? [duplicate]
...aterials:
Shaded, Shiny, Transparent, Matte = range(4)
>>> print Materials.Matte
3
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控件重绘函数/消息OnPaint,OnDraw,OnDrawItem,DrawItem的区别 - C/C++ - 清...
控件重绘函数/消息OnPaint,OnDraw,OnDrawItem,DrawItem的区别而OnPaint()是CWnd的类成员，同时负责响应WM_PAINT消息。OnDraw()是CVIEW的成员函数，并且没有响应消息的功能。这就是为什么你用VC成的程序...OnPaint()是CWnd的类成员，同时负责响应WM_...
How to declare an ArrayList with values? [duplicate]
...n, in the order they are returned by the collection's iterator.
ArrayList(int initialCapacity)
Constructs an empty list with the specified initial capacity.
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