大约有 15,000 项符合查询结果（耗时：0.0617秒） [XML]
What's the difference between eval, exec, and compile?
...on code, and come across the eval() and compile() functions, and the exec statement.
3 Answers
...
MySQL get row position in ORDER BY
...
Use this:
SELECT x.id,
x.position,
x.name
FROM (SELECT t.id,
t.name,
@rownum := @rownum + 1 AS position
FROM TABLE t
JOIN (SELECT @rownum := 0) r
ORDER BY t.name) x
WHE...
How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?
How can I verify my XPath?
6 Answers
6
...
How do I raise the same Exception with a custom message in Python?
...e: For Python 3, check Ben's answer
To attach a message to the current exception and re-raise it:
(the outer try/except is just to show the effect)
For python 2.x where x>=6:
try:
try:
raise ValueError # something bad...
except ValueError as err:
err.message=err.message+...
How to define a two-dimensional array?
...
You're technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this
"list comprehension".
# Creates a list containing 5 lists, each of 8 items, all set to 0
w, h = 8, 5;
Ma...
Visualizing branch topology in Git
...aphy, something like these ASCII maps that seem to be used everywhere for explaining branches?
29 Answers
...
Check if a Python list item contains a string inside another string
...ivierPons, just do if myitem in myarray:
– alldayremix
Mar 21 '13 at 15:26
8
Another way to get a...
Python dictionary: are keys() and values() always the same order?
...ications to the
dictionary, the lists will directly
correspond.
On 2.x documentation and 3.x documentation.
share
|
improve this answer
|
follow
|
...
Return a `struct` from a function in C
...just fine. You can pass structures to functions as well - a structure is exactly the same as any built-in type for purposes of parameter passing, return values, and assignment.
Here's a simple demonstration program that does all three - passes a structure as a parameter, returns a structure from a...