大约有 13,300 项符合查询结果（耗时：0.0163秒） [XML]
Why is the tag deprecated in HTML?
...ccording to W3Schools.com,
The center element was deprecated in HTML 4.01, and is not supported in XHTML 1.0 Strict DTD.
The HTML 4.01 spec gives this reason for deprecating the tag:
The CENTER element is exactly equivalent to specifying the DIV element with the align attribute set to "cen...
How to concatenate strings with padding in sqlite
... can follow along (basically what I proposed) here: http://verysimple.com/2010/01/12/sqlite-lpad-rpad-function/
-- the statement below is almost the same as
-- select lpad(mycolumn,'0',10) from mytable
select substr('0000000000' || mycolumn, -10, 10) from mytable
-- the statement below is almost ...
Good reasons NOT to use a relational database?
...aron: I have one reason: SELECT messages FROM log WHERE (date BETWEEN 2009-01-01 AND 2009-03-01) AND type='error' AND system='windows' :) How would you load that from a text file?
– Tomáš Fejfar
Aug 18 '09 at 10:07
...
What is “String args[]”? parameter in main method Java
...
answered May 21 '09 at 1:01
Dan LewDan Lew
79.2k2727 gold badges176176 silver badges174174 bronze badges
...
Converting numpy dtypes to native python types
...e64(0, 'D').item()) # <class 'datetime.date'>
type(np.datetime64('2001-01-01 00:00:00').item()) # <class 'datetime.datetime'>
type(np.timedelta64(0, 'D').item()) # <class 'datetime.timedelta'>
...
(Another method is np.asscalar(val), however it is deprecated since NumPy 1.16).
...
Best way to resolve file path too long exception
...t it doesn't make any sense. Why is there a path-size limitation??? it is 2017.
– Jaider
Jan 18 '17 at 19:04
...
Logical XOR operator in C++?
...= !(a)
– Chris Lutz
Oct 21 '09 at 0:01
6
@ChrisLutz: yes, but beware of overloaded operators.
...
How can I convert JSON to a HashMap using Gson?
...
Line
1,20122 gold badges1414 silver badges3232 bronze badges
answered Apr 11 '13 at 7:39
cheritcherit
...
How to round up to the nearest 10 (or 100 or X)?
... when x is a vector:
> roundUp(c(0.0023, 3.99, 10, 1003))
[1] 1e-02 1e+01 1e+01 1e+04
..but if you want to round to a "nice" number, you first need to define what a "nice" number is. The following lets us define "nice" as a vector with nice base values from 1 to 10. The default is set to the e...
Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?
...NaT you won't need to specify the dtype)
In [24]: s = Series([Timestamp('20130101'),np.nan,Timestamp('20130102 9:30')],dtype='M8[ns]')
In [25]: s
Out[25]:
0 2013-01-01 00:00:00
1 NaT
2 2013-01-02 09:30:00
dtype: datetime64[ns]``
In [26]: pd.isnull(s)
Out[26]:
0 False
1 ...