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ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...ise-and of the two
boolean arrays.
The NumPy developers felt there was no one commonly understood way to evaluate
an array in boolean context: it could mean True if any element is
True, or it could mean True if all elements are True, or True if the array has non-zero length, just to name three poss...
What is the syntax to insert one list into another list in python?
...) is in place, x+y is returning new list. And x += y, which was not mentioned here, is similar to the extend.
– wim
Jul 22 '18 at 16:18
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How to delete duplicates on a MySQL table?
...ice: this would keep the oldest duplicate record and would erase the newer ones. If you want to keep the newest you cannot do this with ALTER IGNORE.
– Haralan Dobrev
Oct 1 '12 at 10:26
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Bomb dropping algorithm
...he inner layer simpler by >X bombs. So, if we call
the permiter layer one, if we place an extra X bombs somewhere in layer 2 (just
inside layer 1), can we reduce the effort of later bombing away layer 2 by more than
X? In other words, we have to prove we can be greedy in reducing the outer
...
Is there a difference between using a dict literal and a dict constructor?
...he actual dict instance to be created. Braces creates the dict instance in one step.
– NeilG
May 14 '19 at 12:59
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What does the “yield” keyword do?
...tand iterables.
Iterables
When you create a list, you can read its items one by one. Reading its items one by one is called iteration:
>>> mylist = [1, 2, 3]
>>> for i in mylist:
... print(i)
1
2
3
mylist is an iterable. When you use a list comprehension, you create a list,...
One class per file rule in .NET? [closed]
...
One class per file also gives you a better idea of what each check in is changing without looking at the diffs of the file.
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Call apply-like function on each row of dataframe with multiple arguments from each row
...from the dplyr package:
> library(dplyr)
> myf <- function(tens, ones) { 10 * tens + ones }
> x <- data.frame(hundreds = 7:9, tens = 1:3, ones = 4:6)
> mutate(x, value = myf(tens, ones))
hundreds tens ones value
1 7 1 4 14
2 8 2 5 25
3 9 ...
What is the difference between print and puts?
...
puts adds a new line to the end of each argument if there is not one already.
print does not add a new line.
For example:
puts [[1,2,3], [4,5,nil]] Would return:
1
2
3
4
5
Whereas print [[1,2,3], [4,5,nil]]
would return:
[[1,2,3], [4,5,nil]]
Notice how puts does not output the ...
Emacs - Multiple columns one buffer
...ome of the acres of horizontal space I have and see more code on-screen at one time. Is there a method for getting Emacs (or indeed another editor) to show me multiple columns all pointing to the same buffer?
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