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What exactly are iterator, iterable, and iteration?
...aking each item of something, one after another. Any time you use a loop, explicit or implicit, to go over a group of items, that is iteration.
In Python, iterable and iterator have specific meanings.
An iterable is an object that has an __iter__ method which returns an iterator, or which defines ...
How to compile a static library in Linux?
I have a question: How to compile a static library in Linux with gcc , i.e. I need to compile my source code into a file named out.a. Is it sufficient to simply compile with the command gcc -o out.a out.c ? I'm not quite familiar with gcc , hope anyone can give me a hand.
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How to comment out a block of Python code in Vim
...habh-manocha: use visual block (Ctrl-V) to select all the added # and type x to delete them.
– theosp
Apr 1 '10 at 16:18
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Checking to see if one array's elements are in another array in PHP
...s then why in PHP docs about this function they say "Returns FALSE if var exists and has a non-empty, non-zero value. Otherwise returns TRUE. The following things are considered to be empty: array() (an empty array)"? Source: php.net/manual/en/function.empty.php
– Pere
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Getting output of system() calls in Ruby
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I'd like to expand & clarify chaos's answer a bit.
If you surround your command with backticks, then you don't need to (explicitly) call system() at all. The backticks execute the command and return the output as a string. You can th...
What is the purpose of the : (colon) GNU Bash builtin?
...r than true for portability to ancient Bourne-derived shells. As a simple example, consider having neither the ! pipeline operator nor the || list operator (as was the case for some ancient Bourne shells). This leaves the else clause of the if statement as the only means for branching based on exit ...
Numpy - add row to array
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What is X? If it is a 2D-array, how can you then compare its row to a number: i < 3?
EDIT after OP's comment:
A = array([[0, 1, 2], [0, 2, 0]])
X = array([[0, 1, 2], [1, 2, 0], [2, 1, 2], [3, 2, 0]])
add to A all rows from X w...
What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
Can anybody give a clear explanation of how variable assignment really works in Makefiles.
6 Answers
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asp.net mvc: why is Html.CheckBox generating an additional hidden input
I just noticed that Html.CheckBox("foo") generates 2 inputs instead of one, anybody knows why is this so ?
10 Answers
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In Python, how do I create a string of n characters in one line of code?
...haracters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters:
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