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How to base64 encode image in linux bash / shell
...blems to store it in variable so test="$(cat DSC_0251.JPG | base64)" works for me.
– dash00
Jun 4 '13 at 13:21
3
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Should you always favor xrange() over range()?
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For performance, especially when you're iterating over a large range, xrange() is usually better. However, there are still a few cases why you might prefer range():
In python 3, range() does what xrange() used to do and xr...
Python (and Python C API): __new__ versus __init__
...nt, and (usually) returns a new instance of that type. Thus it is suitable for use with both mutable and immutable types.
__init__ accepts an instance as the first argument and modifies the attributes of that instance. This is inappropriate for an immutable type, as it would allow them to be modifi...
Class method decorator with self arguments?
...es how the internal function _impl can access self to manipulate that self for whatever purpose. I needed to build a simple method decorator that incremented a self.id on a subset of the methods in a class, and only those methods in a class that had the "@" decoration syntax applied to it. That Syn...
What is the best regular expression to check if a string is a valid URL?
...C 3987 (http://www.faqs.org/rfcs/rfc3987.html). These are in PCRE syntax.
For absolute IRIs (internationalized):
/^[a-z](?:[-a-z0-9\+\.])*:(?:\/\/(?:(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x{FFEF}\x{10000}-\x{1FFFD}\x{20000}-\x{2FFFD}\x{30000}-\x{3FFFD}\x{40000}-...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...执行后平常执行下面两个其中一个命令
#drbdadm primary --force r0
#drbdadm primary all
第3步:设置当前节点为主节点
# cat /proc/drbd
version: 8.4.6 (api:1/proto:86-101)
GIT-hash: 833d830e0152d1e457fa7856e71e11248ccf3f70 build by root@db01.mysql.com,...
Timer function to provide time in nano seconds using C++
I wish to calculate the time it took for an API to return a value.
The time taken for such an action is in the space of nano seconds. As the API is a C++ class/function, I am using the timer.h to caculate the same:
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Combining C++ and C - how does #ifdef __cplusplus work?
...s that can't be built with C linkage. That means no classes or templates, for example.
extern "C" blocks nest nicely. There's also extern "C++" if you find yourself hopelessly trapped inside of extern "C" regions, but it isn't such a good idea from a cleanliness perspective.
Now, specifically re...
Is there a performance difference between a for loop and a for-each loop?
What, if any, is the performance difference between the following two loops?
16 Answers
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How to make a cross-module variable?
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I don't endorse this solution in any way, shape or form. But if you add a variable to the __builtin__ module, it will be accessible as if a global from any other module that includes __builtin__ -- which is all of them, by default.
a.py contains
print foo
b.py contains
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