大约有 41,270 项符合查询结果（耗时：0.0469秒） [XML]
Python list iterator behavior and next(iterator)
...e(10)))
>>> for i in a:
... print(i)
... next(a)
...
0
1
2
3
4
5
6
7
8
9
So 0 is the output of print(i), 1 the return value from next(), echoed by the interactive interpreter, etc. There are just 5 iterations, each iteration resulting in 2 lines being written to the terminal.
If y...
why unaligned apk is needed?
...|
edited May 29 '15 at 19:36
Beau Grantham
3,31155 gold badges2828 silver badges4343 bronze badges
answe...
ArrayList initialization equivalent to array initialization [duplicate]
...
354
Arrays.asList can help here:
new ArrayList<Integer>(Arrays.asList(1,2,3,5,8,13,21));
...
Breaking loop when “warnings()” appear in R
...
3 Answers
3
Active
...
Ruby on Rails: How can I revert a migration with rake db:migrate?
... you want to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
share
|
improve this answer
|
...
Get type of all variables
...
JamesJames
59.2k1313 gold badges134134 silver badges182182 bronze badges
...
SQL: How to get the count of each distinct value in a column?
...
318
SELECT
category,
COUNT(*) AS `num`
FROM
posts
GROUP BY
category
...
Rails: redirect_to with :error, but flash[:error] empty
I'm trying to do a redirect while setting the flash[:error] value. (Rails 3.0.10)
3 Answers
...
Python try…except comma vs 'as' in except
...
The definitive document is PEP-3110: Catching Exceptions
Summary:
In Python 3.x, using as is required to assign an exception to a variable.
In Python 2.6+, use the as syntax, since it is far less ambiguous and forward compatible with Python 3.x.
In Pyth...