大约有 45,000 项符合查询结果（耗时：0.0493秒） [XML]
Adding a Method to an Existing Object Instance
...t "fooFighters"
...
>>> A.fooFighters = fooFighters
>>> a2 = A()
>>> a2.fooFighters
<bound method A.fooFighters of <__main__.A instance at 0x00A9BEB8>>
>>> a2.fooFighters()
fooFighters
Previously defined instances are updated as well (as long as they ...
MySQL ON vs USING?
...d to just say film_id since that would make for an ambiguity:
ERROR 1052 (23000): Column 'film_id' in field list is ambiguous
As for select *, the joining column appears in the result set twice with ON while it appears only once with USING:
mysql> create table t(i int);insert t select 1;c...
Why would adding a method add an ambiguous call, if it wouldn't be involved in the ambiguity
...ms string[]) in its normal form
1: C(params string[]) in its expanded form
2: C<string>(string)
3: C(string, object)
Candidate zero is obviously inapplicable because string is not convertible to string[]. That leaves three.
Of the three, we must determine a unique best method. We do so b...
php execute a background process
...Linux machine, I've always handled it like this:
exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, $outputfile, $pidfile));
This launches the command $cmd, redirects the command output to $outputfile, and writes the process id to $pidfile.
That lets you easily monitor what t...
Is it correct to use JavaScript Array.sort() method for shuffling?
...
12 Answers
12
Active
...
How to get the input from the Tkinter Text Widget?
...
132
To get Tkinter input from the text box, you must add a few more attributes to the normal .get() ...
File content into unix variable with newlines
...anscript for a demo:
pax> cat num1.txt ; x=$(cat num1.txt)
line 1
line 2
pax> echo $x ; echo '===' ; echo "$x"
line 1 line 2
===
line 1
line 2
The reason why newlines are replaced with spaces is not entirely to do with the echo command, rather it's a combination of things.
When given a ...
What is the difference between LL and LR parsing?
...→ T + E
E → T
T → int
Then given the string int + int + int, an LL(2) parser (which uses two tokens of lookahead) would parse the string as follows:
Production Input Action
---------------------------------------------------------
S int + int + int Predi...
Where is debug.keystore in Android Studio
...tails, hit the green '+' button. I've highlighted in the screenshot.
Step 2) VERY IMPORTANT: Goto Build Types> select your build type and select your "Signing Config". In my case, I've to select "config". Check the highlighted region.
...