大约有 40,000 项符合查询结果（耗时：0.0498秒） [XML]
What is :: (double colon) in Python when subscripting sequences?
...n custom classes to make it do whatever you want
class C(object):
def __getitem__(self, k):
return k
# Single argument is passed directly.
assert C()[0] == 0
# Multiple indices generate a tuple.
assert C()[0, 1] == (0, 1)
# Slice notation generates a slice object.
assert C()[1:2:3] =...
Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con
...eaner and more readable if you change the design rather than use mutable.
http://www.highprogrammer.com/alan/rants/mutable.html
So if the above madness isn't what
mutable is for, what is it for? Here's
the subtle case: mutable is for the
case where an object is logically
constant, but i...
How can I trigger a JavaScript event click
...atchEvent(new Event('click'));
Original Answer
Here is what I use: http://jsfiddle.net/mendesjuan/rHMCy/4/
Updated to work with IE9+
/**
* Fire an event handler to the specified node. Event handlers can detect that the event was fired programatically
* by testing for a 'synthetic=true' p...
What's the simplest way to subtract a month from a date in Python?
...with param month doesn't work but months works In [23]: created_datetime__lt - relativedelta(months=1) Out[23]: datetime.datetime(2016, 11, 29, 0, 0, tzinfo=<StaticTzInfo 'Etc/GMT-8'>) In [24]: created_datetime__lt - relativedelta(month=1) Out[24]: datetime.datetime(2016, 1, 29,...
Copy a table from one database to another in Postgres
...
Extract the table and pipe it directly to the target database:
pg_dump -t table_to_copy source_db | psql target_db
Note: If the other database already has the table set up, you should use the -a flag to import data only, else you may see weird errors like "Out of memory":
pg_dump -a -t ...
Get the current git hash in a Python script
...
The git describe command is a good way of creating a human-presentable "version number" of the code. From the examples in the documentation:
With something like git.git current tree, I get:
[torvalds@g5 git]$ git describe parent
v1.0.4-14-g2...
Divide a number by 3 without using *, /, +, -, % operators
...(int argc, char *argv[])
{
int num = 1234567;
int den = 3;
div_t r = div(num,den); // div() is a standard C function.
printf("%d\n", r.quot);
return 0;
}
share
|
improve this ...
Is it possible to use 'else' in a list comprehension? [duplicate]
..., 2, 3]
So for your example,
table = ''.join(chr(index) if index in ords_to_keep else replace_with
for index in xrange(15))
share
|
improve this answer
|
...
Test if string is a number in Ruby on Rails
...rt of Rails or 1.8? String.is_a?(Numeric) works. See also stackoverflow.com/questions/2095493/….
– Ross Attrill
Jun 16 '14 at 7:10
...
Given two directory trees, how can I find out which files differ by content?
... --brief --recursive dir1/ dir2/ # GNU long options
diff -qr dir1/ dir2/ # common short options
Should do what you need.
If you also want to see differences for files that may not exist in either directory:
diff --brief --recursive --new-file dir1/ dir2/ # GNU long options
diff -qrN dir1/ dir2/ ...