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What does “coalgebra” mean in the contem>x m>t of programming?
...structures which is pretty much incomprehensible to me. Can anyone please em>x m>plain what coalgebras mean in the contem>x m>t of programming, what is their significance, and how they relate to objects and comonads?
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What does |= (single pipe equal) and &=(single ampersand equal) mean
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They're compound assignment operators, translating (very loosely)
m>x m> |= y;
into
m>x m> = m>x m> | y;
and the same for &. There's a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once, but that's basically the gist of it.
In terms of the n...
Count number of occurrences of a pattern in a file (even on same line)
...c -l
2
Two matches are found in the line (a{foo}bar{foo}bar) because we em>x m>plicitly asked to find every occurrence (-o). Every occurence is printed on a separate line, and wc -l just counts the number of lines in the output.
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Take the content of a list and append it to another list
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You probably want
list2.em>x m>tend(list1)
instead of
list2.append(list1)
Here's the difference:
>>> a = range(5)
>>> b = range(3)
>>> c = range(2)
>>> b.append(a)
>>> b
[0, 1, 2, [0, 1, 2, 3, 4]]
>&gt...
Compare if two variables reference the same object in python
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That’s what is is for: m>x m> is y returns True if m>x m> and y are the same object.
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how to make svn diff show only non-whitespace line changes between two revisions
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You can use
svn diff -r 100:200 -m>x m> -b > file.diff
If you want to ignore all whitespaces:
svn diff -m>x m> -w | less
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App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...，实现低成本、高精度的向心力探究实验。
1.1 与 phyphom>x m> 的区别
phyphom>x m>（德国亚琛工业大学开发）可以测量向心加速度 a = r · ω²，但存在以下局限：
对比项phyphom>x m> 离心加速度实验本App（向心力实验）测量物理量向心加速度...
What does the star operator mean, in a function call?
What does the * operator mean in Python, such as in code like zip(*m>x m>) or f(**k) ?
5 Answers
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In Python, if I return inside a “with” block, will the file still close?
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Yes, it acts like the finally block after a try block, i.e. it always em>x m>ecutes (unless the python process terminates in an unusual way of course).
It is also mentioned in one of the em>x m>amples of PEP-343 which is the specification for the with statement:
with locked(myLock):
# Code here em>x m>ec...
The most efficient way to implement an integer based power function pow(int, int)
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Em>x m>ponentiation by squaring.
int ipow(int base, int em>x m>p)
{
int result = 1;
for (;;)
{
if (em>x m>p & 1)
result *= base;
em>x m>p >>= 1;
if (!em>x m>p)
break;
base ...