大约有 44,000 项符合查询结果（耗时：0.0444秒） [XML]
Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
...t_index().drop_duplicates(subset='index', keep='first').set_index('index')
1000 loops, best of 3: 1.54 ms per loop
>>> %timeit df3.groupby(df3.index).first()
1000 loops, best of 3: 580 µs per loop
>>> %timeit df3[~df3.index.duplicated(keep='first')]
1000 loops, best of 3: 307 µ...
ValueError: setting an array element with a sequence
...t isn't shaped like a multi-dimensional array. For example
numpy.array([[1,2], [2, 3, 4]])
or
numpy.array([[1,2], [2, [3, 4]]])
will yield this error message, because the shape of the input list isn't a (generalised) "box" that can be turned into a multidimensional array. So probably UnFilte...
Is Java Regex Thread Safe?
...
133
Yes, from the Java API documentation for the Pattern class
Instances of this (Pattern) class...
“for line in…” results in UnicodeDecodeError: 'utf-8' codec can't decode byte
...
10 Answers
10
Active
...
dynamically add and remove view to viewpager
...ject object)
{
int index = views.indexOf (object);
if (index == -1)
return POSITION_NONE;
else
return index;
}
//-----------------------------------------------------------------------------
// Used by ViewPager. Called when ViewPager needs a page to display; it is ...
How do you generate dynamic (parameterized) unit tests in python?
...
179
This is called "parametrization".
There are several tools that support this approach. E.g.:
...
Check substring exists in a string in C
...
12 Answers
12
Active
...
MySQL: Set user variable from result of query
...but you need to move the variable assignment into the query:
SET @user := 123456;
SELECT @group := `group` FROM user WHERE user = @user;
SELECT * FROM user WHERE `group` = @group;
Test case:
CREATE TABLE user (`user` int, `group` int);
INSERT INTO user VALUES (123456, 5);
INSERT INTO user VALUES...
Shell command to sum integers, one per line?
...
1
2
Next
1364
...
Django select only rows with duplicate field values
...
193
Try:
from django.db.models import Count
Literal.objects.values('name')
.annota...