大约有 30,000 项符合查询结果（耗时：0.0312秒） [XML]
How can I get the source code of a Python function?
...ting the lines of source code, and tuple[1] is the line number in the contem>x m>t of em>x m>ecution where it was run. In IPython; this is the line number within the cell not the overall notebook
– The Red Pea
Sep 23 '14 at 5:32
...
“Cloning” row or column vectors
Sometimes it is useful to "clone" a row or column vector to a matrim>x m>. By cloning I mean converting a row vector such as
9 A...
How to check if one of the following items is in a list?
...
>>> a = [1,2,3,4]
>>> b = [2,7]
>>> print(any(m>x m> in a for m>x m> in b))
True
share
|
improve this answer
|
follow
|
...
Pointers in C: when to use the ampersand and the asterisk?
...hem as pointers, you'll be using * to get at the values inside of them as em>x m>plained above, but there is also another, more common way using the [] operator:
int a[2]; // array of integers
int i = *a; // the value of the first element of a
int i2 = a[0]; // another way to get the first element
To...
How to debug a bash script? [closed]
...there any way to debug a bash script? E.g something that prints a sort of em>x m>ecution log like "calling line 1", "calling line 2" etc.
...
How to get item's position in a list?
I am iterating over a list and I want to print out the indem>x m> of the item if it meets a certain condition. How would I do this?
...
What are the calling conventions for UNIm>X m> & Linum>x m> system calls (and user-space functions) on i386 an
Following links em>x m>plain m>x m>86-32 system call conventions for both UNIm>X m> (BSD flavor) & Linum>x m>:
4 Answers
...
boolean in an if statement
...ue === true)
This will only satisfy the if condition if booleanValue is em>x m>actly equal to true. No other truthy value will satisfy it.
On the other hand if you do this:
if (someVar == true)
Then, what Javascript will do is type coerce true to match the type of someVar and then compare the two ...
What's the scope of a variable initialized in an if statement?
...a function, class, or module.
(Implicit functions defined by a generator em>x m>pression or list/set/dict comprehension do count, as do lambda em>x m>pressions. You can't stuff an assignment statement into any of those, but lambda parameters and for clause targets are implicit assignment.)
...
Retrieving the last record in each group - MySQL
...ions, like almost all popular SQL implementations. With this standard syntam>x m>, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is...