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Asterisk in function call
... sequence into separate arguments for the function call.
>>> def foo(a, b=None, c=None):
... print a, b, c
...
>>> foo([1, 2, 3])
[1, 2, 3] None None
>>> foo(*[1, 2, 3])
1 2 3
>>> def bar(*a):
... print a
...
>>> bar([1, 2, 3])
([1, 2, 3],)
>>...
Why dict.get(key) instead of dict[key]?
... @MustafaS: For example, suppose x = {'a':0}. Then x.get('a', 'foo') returns 0 but x.get('a') or 'foo' returns 'foo'.
– unutbu
Dec 4 '15 at 22:27
5
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How do I use CREATE OR REPLACE?
...
There is no create or replace table in Oracle.
You must:
DROP TABLE foo;
CREATE TABLE foo (....);
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Absolute vs relative URLs
...
See this: http://en.wikipedia.org/wiki/URI_scheme#Generic_syntax
foo://username:password@example.com:8042/over/there/index.dtb;type=animal?name=ferret#nose
\ / \________________/\_________/ \__/ \___/ \_/ \_________/ \_________/ \__/
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PDB文件：每个开发人员都必须知道的 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...对于private builds，只是存储了PDB文件的全路径，例如在c:\foo下的源文件mycode.cpp，在pdb文件中存储的路径为c:\foo\mycode.cpp。对于private builds可以使用虚拟盘来增加PDB对绝对路径的依赖，例如可以使用subst.exe将源代码路径挂载为V:，在...
How to change variables value while debugging with LLDB in Xcode?
...
expr myString = @"Foo"
(lldb) help expr
Evaluate a C/ObjC/C++ expression in the current
program context, using variables currently in scope. This command
takes 'raw' input (no need to quote stuff).
Syntax: expression --...
Using global variables in a function
...t, it is assumed to be global.
>>> import dis
>>> def foo():
... global bar
... baz = 5
... print bar
... print baz
... print quux
...
>>> dis.disassemble(foo.func_code)
3 0 LOAD_CONST 1 (5)
3 STORE_FAST ...
What's the difference between parenthesis $() and curly bracket ${} syntax in Makefile?
... followed by the
name of the variable in parentheses or braces: either $(foo) or
${foo} is a valid reference to the variable foo.
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Is a memory leak created if a MemoryStream in .NET is not closed?
... hiding means you may at some future point want to refactor:
MemoryStream foo()
{
MemoryStream ms = new MemoryStream();
// write stuff to ms
return ms;
}
to:
Stream foo()
{
...
}
This emphasizes that callers should not care what kind of Stream is being returned, ...
How do you reverse a string in place in JavaScript?
...r, there are some problems with this solution. For example:
naiveReverse('foo ???? bar');
// → 'rab �� oof'
// Where did the `????` symbol go? Whoops!
If you’re wondering why this happens, read up on JavaScript’s internal character encoding. (TL;DR: ???? is an astral symbol, and JavaScr...