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Python: most idiomatic way to convert None to empty string?
...lt-in, but return an empty string when the argument is None, do this:
def xstr(s):
if s is None:
return ''
return str(s)
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How can a Javascript object refer to values in itself? [duplicate]
... it works only if you have a flat obj, like the one in your example. It will not work if you have nested keys.
– Green
Sep 29 '15 at 3:26
1
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How to output numbers with leading zeros in JavaScript [duplicate]
I can round to x amount of decimal places with math.round but is there a way to round left of the decimal? for example 5 becomes 05 if I specify 2 places
...
Numpy: Get random set of rows from 2D array
... 1],
[0, 4, 1],
[2, 4, 2],
[3, 3, 1]])
>>> idx = np.random.randint(10, size=2)
>>> idx
array([7, 6])
>>> A[idx,:]
array([[0, 4, 1],
[1, 3, 1]])
Putting it together for a general case:
A[np.random.randint(A.shape[0], size=2), :]
For non repl...
Two way/reverse map [duplicate]
...pe by subclassing dict and adding the logic that you want. Here's a basic example:
class TwoWayDict(dict):
def __setitem__(self, key, value):
# Remove any previous connections with these values
if key in self:
del self[key]
if value in self:
del s...
how to get request path with express req object
I'm using express + node.js and I have a req object, the request in the browser is /account but when I log req.path I get '/' --- not '/account'.
...
Efficient SQL test query or validation query that will work across all (or most) databases
...aries provide the ability to test their SQL connections for idleness. For example, the JDBC pooling library c3p0 has a property called preferredTestQuery , which gets executed on the connection at configured intervals. Similarly, Apache Commons DBCP has validationQuery .
...
How to create REST URLs without verbs?
...u modify the (application) state of the resource, you actually update the existing resource, not create some new resource or post a processing request.
– Andrey Vlasovskikh
Oct 24 '09 at 21:45
...
What are “first class” objects?
...ge have.
Depending on the language, this can
imply:
being expressible as an anonymous literal value
being storable in variables
being storable in data structures
having an intrinsic identity (independent of any given name)
being comparable for equality with other entities
b...
How do I create a unique ID in Java? [duplicate]
...yone (as the entire space is larger than the number of atoms estimated to exist in the Universe) as to be 100% guaranteed. And if you need global uniqueness, it is the easiest way to achieve that. However, if you only need local uniqueness (i.e. to a current existing application) then AtomicIntege...