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Python __call__ special method practical example
...yesterday that makes a version of the hashlib.foo methods that hash entire files rather than strings:
# filehash.py
import hashlib
class Hasher(object):
"""
A wrapper around the hashlib hash algorithms that allows an entire file to
be hashed in a chunked manner.
"""
def __init...
Remove HTML Tags from an NSString on the iPhone
...ook up "Objective-C Category" in Google. Then you add that method in the m file, and the prototype in the h file. When that is all set up, to use it all you have to do is have a string object (Example: NSString *myString = ...) and you call that method on your string object (NSString *strippedString...
How to Sync iPhone Core Data with web server, and then push to other devices? [closed]
...ing, see the paper from Russ Cox (MIT) and William Josephson (Princeton):
File Synchronization with Vector Time Pairs
which applies equally well to core data with some obvious modifications. This provides an overall much more robust and reliable sync strategy, but requires more effort to be implem...
Android XML Percent Symbol
...
In your strings.xml file you can use any Unicode sign you want.
For example, the Unicode number for percent sign is 0025:
<string name="percent_sign">&#x0025;</string>
You can see a comprehensive list of Unicode signs here
...
Cannot download Docker images behind a proxy
...Docker service:
mkdir /etc/systemd/system/docker.service.d
Now create a file called /etc/systemd/system/docker.service.d/http-proxy.conf that adds the HTTP_PROXY environment variable:
[Service]
Environment="HTTP_PROXY=http://proxy.example.com:80/"
If you have internal Docker registries that yo...
When you exit a C application, is the malloc-ed memory automatically freed?
...nal resources that are not cleaned up by the OS on exit, such as temporary files or any kind of change to the state of an external resource, then you will need code to deal with all of those things on exit, and this is often elegantly combined with freeing memory.
If your program starts having a lon...
Global access to Rake DSL methods is deprecated
...nstant Rake::DSL. It refers to a @DHH tweet.
Put the following in your Gemfile
gem "rake", "0.8.7"
You may see something like
rake aborted!
You have already activated Rake 0.9.1 ...
I still had a copy of Rake 0.9.1 in my directory so I deleted it.
You can "delete" Rake 0.9.1 by running the ...
Spring @Autowired usage
...a value in having a "centralized, declarative, configuration" like the xml files we all used to use. Then I realized that most of the stuff in the files wasn't configuration - it was never changed anywhere after development, ever. Then I realized that "centralized" only has value in quite small syst...
Upgrade python in a virtualenv
...s to the old virtualenv, you should save the dependencies in a requirement file (pip freeze > requirements.txt) and make a backup of it somewhere else. If anything goes wrong, you can still create a new virtualenv and install the old dependencies in it (pip install -r requirements.txt).
Updated:...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
...seems that it has no advantage over sha1. I also tested some cases on real files and the results were always the same in both cases (likely limited by disk I/O).
md5sum of a large 4.6GB file took the exact same time than sha1sum of the same file, same goes with many small files (488 in the same dir...