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Python memoising/deferred lookup property decorator
... @lazyprop
def a(self):
print 'generating "a"'
return range(5)
Interactive session:
>>> t = Test()
>>> t.__dict__
{}
>>> t.a
generating "a"
[0, 1, 2, 3, 4]
>>> t.__dict__
{'_lazy_a': [0, 1, 2, 3, 4]}
>>> t.a
[0, 1, 2, 3, 4]
...
How do I create test and train samples from one dataframe with pandas?
...ay of size len(df) with randomly and uniformly distributed float values in range [0, 1]. The < 0.8 applies the comparison element-wise and stores the result in place. Thus values < 0.8 become True and value >= 0.8 become False
– Kentzo
Dec 6 '18 at 0:4...
Possible reasons for timeout when trying to access EC2 instance
... active security
group. In the inbound dialog below, enter 22 in the port range, your local IP/32 in the source field, and leave 'custom tcp rule' in the dropdown.
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What is an index in SQL?
....
This makes clustered indexes great for retrieving lots of data based on range based queries since all the data is located next to each other.
Since the clustered index is actually related to how the data is stored, there is only one of them possible per table (although you can cheat to simulate ...
How to read a file in reverse order?
... yield segment
segment = lines[0]
for index in range(len(lines) - 1, 0, -1):
if lines[index]:
yield lines[index]
# Don't yield None if the file was empty
if segment is not None:
yield segment
...
What is the equivalent of the C++ Pair in Java?
... sum up, in my opinion it is better to have a class Position(x,y), a class Range(begin,end) and a class Entry(key,value) rather than a generic Pair(first,second) that doesn't tell me anything about what it's supposed to do.
...
What is the difference between lemmatization vs stemming?
...ng information retrieval over a billion documents with 99% of your queries ranging from 1-3 words, you can settle for stemming.
As for NLTK, the WordNetLemmatizer does use the part of speech, though you have to provide it (otherwise it defaults to nouns). Passing it "dove" and "v" yields "dive" wh...
ASP.NET WebApi vs MVC ? [closed]
...s a framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices. ASP.NET Web API is an ideal platform for building RESTful applications on the .NET Framework.
you can read more form here
http://www.dotnet-tricks.com/Tutorial/webapi/...
Convert bytes to a string
...n Codepage Layout - it is where Python chokes with infamous ordinal not in range.
UPDATE 20150604: There are rumors that Python 3 has the surrogateescape error strategy for encoding stuff into binary data without data loss and crashes, but it needs conversion tests, [binary] -> [str] -> [bina...
Display image as grayscale using matplotlib
...en images, this is fine, you won't see a different. But if you have narrow range of pixel value image, say the min pixel is 156 and the max pixel is 234. The gray image will looks totally wrong.
The right way to show an image in gray is
from matplotlib.colors import NoNorm
...
plt.imshow(img,cmap=...