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How to implement an ordered, default dict? [duplicate]
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The following (using a modified version of this recipe) works for me:
from collections import OrderedDict, Callable
class DefaultOrderedDict(OrderedDict):
# Source: http://stackoverflow.com/a/6190500/562769
def __init__(self, default_factory=None, *a, **kw):
if (defaul...
What are good uses for Python3's “Function Annotations”
...kground, I can tell you that annotations have proved themselves invaluable for enabling smart static analyzers for languages like Java. For instance, you could define semantics like state restrictions, threads that are allowed to access, architecture limitations, etc., and there are quite a few tool...
What is the meaning of “__attribute__((packed, aligned(4))) ”
...
Before answering, I would like to give you some data from Wiki
Data structure alignment is the way data is arranged and accessed in computer memory. It consists of two separate but related issues: data alignment and data str...
How does python numpy.where() work?
..., True], dtype=bool)`
This is done by overloading the "__gt__" method. For instance:
>>> class demo(object):
def __gt__(self, item):
print item
>>> a = demo()
>>> a > 4
4
As you can see, "a > 4" was valid code.
You can get a full list and docume...
Timeout a command in bash without unnecessary delay
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I think this is precisely what you are asking for:
http://www.bashcookbook.com/bashinfo/source/bash-4.0/examples/scripts/timeout3
#!/bin/bash
#
# The Bash shell script executes a command with a time-out.
# Upon time-out expiration SIGTERM (15) is sent to the process. I...
Case insensitive 'in'
...
username = 'MICHAEL89'
if username.upper() in (name.upper() for name in USERNAMES):
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Alternatively:
if username.upper() in map(str.upper, USERNAMES):
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Or, yes, you can make a custom method.
...
How do I get an object's unqualified (short) class name?
...ceof. (You can do it with ReflectionClass, but it would have much worse performance.)
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How to get the return value from a thread in python?
...ain thread:
import concurrent.futures
def foo(bar):
print('hello {}'.format(bar))
return 'foo'
with concurrent.futures.ThreadPoolExecutor() as executor:
future = executor.submit(foo, 'world!')
return_value = future.result()
print(return_value)
...
Cannot kill Python script with Ctrl-C
...blem - once the main thread has started your threads, there's nothing else for it to do. So it exits, and the threads are destroyed instantly. So let's keep the main thread alive:
import time
while True:
time.sleep(1)
Now it will keep print 'first' and 'second' until you hit Ctrl+C.
Edit: as...
MySQL: What's the difference between float and double?
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They both represent floating point numbers. A FLOAT is for single-precision, while a DOUBLE is for double-precision numbers.
MySQL uses four bytes for single-precision values and eight bytes for double-precision values.
There is a big difference from floating point numbers and ...