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What's valid and what's not in a URI query?
... also be defined as a delimiter within the generic or scheme-specific syntax and the appearance of the character must be within data.
The current standard for generic URIs is RFC 3986, which has this to say:
2.2. Reserved Characters
URIs include components and subcomponents that are delimited by ...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...择合适的内存管理算法会带来明显的性能提升。比如nginx， 它在每个连接accept后
需求
系统的物理内存是有限的，而对内存的需求是变化的, 程序的动态性越强，内存管理就越重要，选择合适的内存管理算法会带来明显的性能...
How do you crash a JVM?
...
The closest thing to a single "answer" is System.exit() which terminates the JVM immediately without proper cleanup. But apart from that, native code and resource exhaustion are the most likely answers. Alternatively you can go looking on Sun's bug tracker for bugs in your v...
Determine the line of code that causes a segmentation fault?
... Use bt as a shorthand for backtrace.
– rustyx
May 27 '19 at 7:53
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What is this date format? 2011-08-12T20:17:46.384Z
...y.
The java.time classes use ISO 8601 by default when parsing/generating textual representations of date-time values.
The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds. That class can directly parse your input string without bothering to define a formattin...
What is the difference between join and merge in Pandas?
... as pd
left = pd.DataFrame({'key': ['foo', 'bar'], 'val': [1, 2]}).set_index('key')
right = pd.DataFrame({'key': ['foo', 'bar'], 'val': [4, 5]}).set_index('key')
left.join(right, lsuffix='_l', rsuffix='_r')
val_l val_r
key
foo 1 4
bar 2 5
The same functionali...
looping through an NSMutableDictionary
...
@Adam On MacOS X, I had pretty mixed up order (not order of insertion, not alphabetic, nothing), but consistent between calls.
– jv42
Feb 24 '13 at 10:24
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Relative paths in Python
...If so, that doesn't appear to be the case on my system (python 2.5.1 on OS X 10.5.7):
#foo.py
import os
print os.getcwd()
print __file__
#in the interactive interpreter
>>> import foo
/Users/jason
foo.py
#and finally, at the shell:
~ % python foo.py
/Users/jason
foo.py
However, I do kn...
HTML/CSS: Make a div “invisible” to clicks?
...us reasons, I need to put a (mostly) transparent <div> over some text. However, this means that the text can't be clicked (eg, to click links or select it). Would it be possible to simply make this div "invisible" to clicks and other mouse events?
...
How to delete last character from a string using jQuery?
...so much jQuery nowadays, sometimes i forget how to do in plain javascript =X
– Michel Ayres
Feb 16 '12 at 20:26
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