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Matrix Transpose in Python
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Python 2:
>>> theArray = [['a','b','c'],['d','e','f'],['g','h','i']]
>>> zi...
When is SQLiteOpenHelper onCreate() / onUpgrade() run?
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359
SQLiteOpenHelper onCreate() and onUpgrade() callbacks are invoked when the database is actuall...
Fastest hash for non-cryptographic uses?
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13 Answers
13
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Find a file in python
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edited Nov 12 '09 at 19:33
answered Nov 12 '09 at 19:25
N...
Collisions when generating UUIDs in JavaScript?
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My best guess is that Math.random() is broken on your system for some reason (bizarre as that s...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
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3446
With new_list = my_list, you don't actually have two lists. The assignment just copies the re...
How do I save and restore multiple variables in python?
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# Saving the objects:
with open('objs.pkl', 'w') as f: # Python 3: open(..., 'wb')
pickle.dump([obj0, obj1, obj2], f)
# Getting back the objects:
with open('objs.pkl') as f: # Python 3: open(..., 'rb')
obj0, obj1, obj2 = pickle.load(f)
If you have a lot of data, you can reduce...
Error while installing json gem 'mkmf.rb can't find header files for ruby'
...ll ruby2.0-dev
sudo apt-get install ruby2.2-dev
sudo apt-get install ruby2.3-dev
or, generic way:
sudo apt-get install ruby-dev
or
sudo apt-get install ruby`ruby -e 'puts RUBY_VERSION[/\d+\.\d+/]'`-dev
The first link you’ve posted is exactly your case: there is no ruby development...
Simple basic explanation of a Distributed Hash Table (DHT)
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3 Answers
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Python UTC datetime object's ISO format doesn't include Z (Zulu or Zero offset)
...etime.utcnow().replace(tzinfo=simple_utc()).isoformat()
'2014-05-16T22:51:53.015001+00:00'
Note that this DOES conform to the ISO 8601 format, which allows for either Z or +00:00 as the suffix for UTC. Note that the latter actually conforms to the standard better, with how time zones are represent...