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How to loop backwards in python? [duplicate]
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range() and xrange() take a third parameter that specifies a step. So you can do the following.
range(10, 0, -1)
Which gives
[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
But for iteration, you should really be using xrange instead....
Which kind of pointer do I use when?
...ovides a better solution. —end note ]
No ownership:
Use dumb pointers (raw pointers) or references for non-owning references to resources and when you know that the resource will outlive the referencing object / scope. Prefer references and use raw pointers when you need either nullability or re...
Executing multi-line statements in the one-line command-line?
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you could do
echo -e "import sys\nfor r in range(10): print 'rob'" | python
or w/out pipes:
python -c "exec(\"import sys\nfor r in range(10): print 'rob'\")"
or
(echo "import sys" ; echo "for r in range(10): print 'rob'") | python
or @SilentGhost's answer / @...
How to use a decimal range() step value?
...f you really want to use a floating-point step value, you can, with numpy.arange.
>>> import numpy as np
>>> np.arange(0.0, 1.0, 0.1)
array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9])
Floating-point rounding error will cause problems, though. Here's a simple ca...
Numeric for loop in Django templates
...acky, but adding a template tag just because you need to loop over a small range for one time in a project isn't such a great solutions also.
– tobltobs
Mar 14 '17 at 20:33
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Brew doctor says: “Warning: /usr/local/include isn't writable.”
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For High Sierra:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Then, try your brew commands.
Issue #3285
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How do I create a list of random numbers without duplicates?
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This will return a list of 10 numbers selected from the range 0 to 99, without duplicates.
import random
random.sample(range(100), 10)
With reference to your specific code example, you probably want to read all the lines from the file once and then select random lines from the ...
Is there a Python Library that contains a list of all the ascii characters?
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Here it is:
[chr(i) for i in xrange(127)]
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Why are Standard iterator ranges [begin, end) instead of [begin, end]?
...ent easily is the one made by Dijkstra himself:
You want the size of the range to be a simple difference end − begin;
including the lower bound is more "natural" when sequences degenerate to empty ones, and also because the alternative (excluding the lower bound) would require the existence of...
Switch on ranges of integers in JavaScript [duplicate]
...ne");
break;
}
It is not necessary to check the lower end of the range because the break statements will cause execution to skip remaining cases, so by the time execution gets to checking e.g. (x < 9) we know the value must be 5 or greater.
Of course the output is only correct if the c...