大约有 45,000 项符合查询结果（耗时：0.0620秒） [XML]
How to pick just one item from a generator?
...
Everytime you would like an item, use
next(g)
(or g.next() in Python 2.5 or below).
If the generator exits, it will raise StopIteration. You can either catch this exception if necessary, or use the default argument to next():
next(g, default_value)
...
TextView - setting the text size programmatically doesn't seem to work
I am using Eclipse Indigo, testing on 2 emulators(2.2 and 3.0).
7 Answers
7
...
How do I get an empty array of any size in python?
...
241
If by "array" you actually mean a Python list, you can use
a = [0] * 10
or
a = [None] * 10...
Determine the number of NA values in a column
...
321
You're over-thinking the problem:
sum(is.na(df$col))
...
How do you write multiline strings in Go?
...e string is delimited by backticks instead of double quotes.
`line 1
line 2
line 3`
share
|
improve this answer
|
follow
|
...
How to get arguments with flags in Bash
...
|
edited Jul 24 '19 at 5:04
Pablo Bianchi
8431313 silver badges2121 bronze badges
answered ...
Rails 3 migrations: Adding reference column?
...
205
If you are using the Rails 4.x you can now generate migrations with references, like this:
ra...
How is performance affected by an unused using directive?
...
answered Jul 22 '09 at 2:34
JaredParJaredPar
648k133133 gold badges11601160 silver badges13951395 bronze badges
...
How to migrate back from initial migration in Django 1.7?
...
2 Answers
2
Active
...
How do I step out of a loop with Ruby Pry?
...
|
edited May 22 '19 at 14:05
Qortex
4,71322 gold badges2626 silver badges4747 bronze badges
...