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What does 'require: false' in Gemfile mean?
...probably it does more requires of its own. Even if you require 'yaml', you now have the YAML module as an object in memory.
– Nathan Long
Oct 17 '13 at 19:31
2
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What's the difference between eval, exec, and compile?
...built-in function (both are built-in functions in Python 3).
It is a well-known fact that the official syntax of exec in Python 2 is exec code [in globals[, locals]].
Unlike majority of the Python 2-to-3 porting guides seem to suggest, the exec statement in CPython 2 can be also used with syntax th...
How to disable GCC warnings for a few lines of code
...of the diagnostics as of each push, and restore to that point at each pop. If a pop has no matching push, the command-line options are restored." -- from the GCC manual: gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html
– bobpaul
Jan 11 '13 at 18:43
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What is the most efficient way of finding all the factors of a number in Python?
...st.__add__,
([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))
This will return all of the factors, very quickly, of a number n.
Why square root as the upper limit?
sqrt(x) * sqrt(x) = x. So if the two factors are the same, they're both the square root. If you make o...
PHP Get name of current directory
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Note that if you use an include or a required, __DIR__ is the path of the included file and NOT the current directory
– Sebastien Horin
Feb 16 '15 at 12:41
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How to make an unaware datetime timezone aware in python
...15, 12, 0)
aware = datetime.datetime(2011, 8, 15, 8, 15, 12, 0, pytz.UTC)
now_aware = pytz.utc.localize(unaware)
assert aware == now_aware
For the UTC timezone, it is not really necessary to use localize since there is no daylight savings time calculation to handle:
now_aware = unaware.replace(t...
C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...Excel 文件，有时候打开EXCEL文件就要
void CloseExcelFile(BOOL if_save = FALSE);
//另存为一个EXCEL文件
void SaveasXSLFile(const CString &xls_file);
///取得打开文件的名称
CString GetOpenFileName();
///取得打开sheet的名称
CString GetLoadSheetName();
/...
Try catch statements in C
...tjmp and longjmp calls.
static jmp_buf s_jumpBuffer;
void Example() {
if (setjmp(s_jumpBuffer)) {
// The longjmp was executed and returned control here
printf("Exception happened here\n");
} else {
// Normal code execution starts here
Test();
}
}
void Test() {
// Rough eq...
Exiting from python Command Line
To exit from Python command line, I have to type exit(). If I type exit, it says
11 Answers
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Is the list of Python reserved words and builtins available in a library?
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To verify that a string is a keyword you can use keyword.iskeyword; to get the list of reserved keywords you can use keyword.kwlist:
>>> import keyword
>>> keyword.iskeyword('break')
True
>>> keyword.kwl...