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Select between two dates with Django
... in a model. You can set the DateField's auto_now_add parameter to True in order to have it easily.
– Benbb96
Mar 26 '18 at 13:28
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Transposing a 2D-array in JavaScript
...p calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexes of the array which have assigned values; it is not invoked for indexes which have been deleted or which have never been assigned values....
What is the minimum valid JSON?
... to be one such example which only accepts objects and arrays as the root. PHP, on the other hand, specifically adds the exception that "it will also encode and decode scalar types and NULL".
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What is the point of function pointers?
...nters is the C library qsort() function, which implements a Quick Sort. In order to be universal for any and all data structures the user may come up with, it takes a couple of void pointers to sortable data and a pointer to a function that knows how to compare two elements of these data structures....
Length of generator output [duplicate]
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I have a filtered list I expect to be on the order of 2000000000 elements. I can't just use a regular list; I need to use a generator. Now, because of how these elements are being sourced, I can actually run through them pretty efficiently -- I just can't store them bec...
Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
...ll to grow in height. (Of course, you need to get the constraints right in order for this to work correctly!)
Getting your constraints right is definitely the hardest and most important part of getting dynamic cell heights working with Auto Layout. If you make a mistake here, it could prevent every...
What is the difference between 'my' and 'our' in Perl?
...e.
Declaring a variable with our allows you to predeclare variables in order to use them under use strict without getting typo warnings or compile-time errors. Since Perl 5.6, it has replaced the obsolete use vars, which was only file-scoped, and not lexically scoped as is our.
For example, the...
How to call a Parent Class's method from Child Class in Python?
...sing inherited methods that have been overridden in a class.
The search order is same as that used by getattr() except that the type itself is skipped.
Example:
class A(object): # deriving from 'object' declares A as a 'new-style-class'
def foo(self):
print "foo"
class B(A):
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Getting number of elements in an iterator in Python
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It's important to note (which I overlooked) that the order of arguments to zip matters: if you pass zip(counter, iterable), you'll actually get 1 more than the iterable count!
– Kye W Shi
Jul 26 '19 at 5:08
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Name node is in safe mode. Not able to leave
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In order to forcefully let the namenode leave safemode, following command should be executed:
bin/hadoop dfsadmin -safemode leave
You are getting Unknown command error for your command as -safemode isn't a sub-command for ha...