大约有 15,000 项符合查询结果（耗时：0.0451秒） [XML]
What exactly is a C pointer if not a memory address?
...be some kind of ID or handle or a combination of several IDs (say hello to x86 segments and offsets) and not necessarily a real memory address. This ID could be anything, even a fixed-size text string. Non-address representations may be especially useful for a C interpreter.
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How can I open multiple files using “with open” in Python?
...o_something()
In earlier versions of Python, you can sometimes use
contextlib.nested() to nest context managers. This won't work as expected for opening multiples files, though -- see the linked documentation for details.
In the rare case that you want to open a variable number of files all a...
How to get unique values in an array
...n about it in the comments for @Rocket's answer, I may as well provide an example that uses no libraries. This requires two new prototype functions, contains and unique
Array.prototype.contains = function(v) {
for (var i = 0; i < this.length; i++) {
if (this[i] === v) return true;
...
What is a monad?
... looked at Haskell recently, what would be a brief, succinct, practical explanation as to what a monad essentially is?
46...
How to subtract X days from a date using Java calendar?
Anyone know a simple way using Java calendar to subtract X days from a date?
10 Answers
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How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators dif
...en the loosely == equal operator and the strict === identical operator is exactly explained in the manual:
Comparison Operators
┌──────────┬───────────┬───────────────────────────────...
Linux c++ error: undefined reference to 'dlopen'
I work in Linux with C++ (Eclipse), and want to use a library.
Eclipse shows me an error:
10 Answers
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Detect and exclude outliers in Pandas data frame
... remove all rows that have outliers in at least one column, the following expression would do that in one shot.
df = pd.DataFrame(np.random.randn(100, 3))
from scipy import stats
df[(np.abs(stats.zscore(df)) < 3).all(axis=1)]
description:
For each column, first it computes the Z-score of ea...
Which iOS app version/build number(s) MUST be incremented upon App Store release?
...of the conditions is "You cannot re-use Version Numbers," but in the last example, version numbers are staying the same while build numbers are increasing. Am I misinterpreting something?
– Emil
Mar 20 '18 at 17:05
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How can I find the current OS in Python? [duplicate]
...form (docs) to get the platform. sys.platform will distinguish between linux, other unixes, and OS X, while os.name is "posix" for all of them.
For much more detailed information, use the platform module. This has cross-platform functions that will give you information on the machine architecture, ...