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Colon (:) in Python list index [duplicate]
... Does not work with dictionaries. applying d[:5] is the eqivalent of d.__getitem__(slice(0, 5, None)). A slice is not hashable.
– Steve Zelaznik
Jul 4 '15 at 2:31
7
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Python - Count elements in list [duplicate]
...:
>>> l = ['a','b','c']
>>> len(l)
3
>>> l.__len__()
3
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Compile (but do not run) a Python script [duplicate]
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py_compile — Compile Python source files
import py_compile
py_compile.compile('my_script.py')
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How do you calculate program run time in python? [duplicate]
...d what you wanted to time): print timeit.timeit('myOwnFunc()', setup='from __main__ import myOwnFunc', number=1). Without the setup parameter, it will complain that it could not find myOwnFunc.
– Landshark666
Dec 24 '12 at 4:13
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Remove duplicate entries using a Bash script [duplicate]
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Perl one-liner similar to @kev's awk solution:
perl -ne 'print if ! $a{$_}++' input
This variation removes trailing whitespace before comparing:
perl -lne 's/\s*$//; print if ! $a{$_}++' input
This variation edits the file in-place:
perl -i -ne 'print if ! $a{$_}++' input
This variation e...
Calling filter returns [duplicate]
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@Mr_and_Mrs_D try putting an iterator object itObj in [] and you will get [itObj], while putting in list() you will get values from object like [1, 4, 7], assuming itObj has these values.
– user2846569
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require file as string
... for anyone who comes across this post. nodejs.org/api/globals.html#globals_require_extensions
– blockloop
Jul 17 '13 at 18:35
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ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升
...> punk;
下面三个例子完全相同
CComPtr<IXXX> pno;
CComPtr<IXXX,&__uuidof(IXXX)> pno;
CComPtr<IXXX,&IID_IXXX> pno;
CComQIPtr可以用任何一个类型的接口指针初始化，如果初始化的值与CComQIPtr的类型相同，那么构造函数简单调用 指针的AddRef,但是，如...
Visul C++中CList用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...和构造方法
CList的声明如下：
template< class TYPE, class ARG_TYPE >class CList : public CObject
由此，我们知道CList是一个模版类，那么他的两个class是什么意思呢？
下面看一个例子：
CList<CString ,CString&> list;//链表对象1
CList<CString,CString> l...
64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...混淆。int是由编程语言设计决定的，不受编译器的影响。__int64才是8位的。另外，指针是受编译器 OS影响的，3...int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的，不受编译器的影响。
__int64才是8位的。
另外，指...