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Flatten nested dictionaries, compressing keys
...atten(...) can be recovered from the alleged duplicate by mapping a higher-order accumulator, one cannot recover the keys. (edit: Also it turns out that the alleged duplicate owner's question is completely different, in that it only deals with dictionaries exactly 2-level deep, though one of the ans...
Python Pandas: Get index of rows which column matches certain value
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How to set the current working directory? [duplicate]
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Difference between a theta join, equijoin and natural join
...h no name. I know it is not a set because, among other reasons, the column order is significant. It's not even a SQL table or SQL table expression. I call it a resultset.
share
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improve this answe...
Evil Mode best practice? [closed]
... all this is great, I added some in wikemacs: wikemacs.org/index.php/Evil#Configuration
– Ehvince
Aug 8 '13 at 9:16
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Ways to implement data versioning in MongoDB
..., content: "bar" }
]
}
data contains all versions. The data array is ordered, new versions will only get $pushed to the end of the array. data.vid is the version id, which is an incrementing number.
Get the most recent version:
find(
{ "_id":ObjectId("...") },
{ "data":{ $slice:-1 } ...
Decorators with parameters?
...turn repl
return layer
This can be applied to a regular decorator in order to add parameters. So for instance, say we have the decorator which doubles the result of a function:
def double(f):
def aux(*xs, **kws):
return 2 * f(*xs, **kws)
return aux
@double
def function(a):
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What is the instanceof operator in JavaScript?
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In order to get the prototype link, use Object.getPrototypeOf(o), this will be the same as the __proto__you describe, but conforms to ECMAScript.
– froginvasion
Jul 30 '14 at 9:33
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What does “#define _GNU_SOURCE” imply?
... Of course, everyone knows the real reason to define _GNU_SOURCE is in order to get strfry and memfrob.
– user4815162342
Mar 9 '13 at 20:40
5
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Remove characters except digits from string using Python?
...op
is 50% slower than RE, so the .translate approach beats it by over an order of magnitude.
In Python 3, or for Unicode, you need to pass .translate a mapping (with ordinals, not characters directly, as keys) that returns None for what you want to delete. Here's a convenient way to express this ...