大约有 15,000 项符合查询结果（耗时：0.0245秒） [XML]
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...al code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or (a-b).all().
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Maintain/Save/Restore scroll position when returning to a ListView
... - mList.getPaddingTop());
// ...
// restore index and position
mList.setSelectionFromTop(index, top);
Explanation:
ListView.getFirstVisiblePosition() returns the top visible list item. But this item may be partially scrolled out of view, and if you want to restore the exact scroll position of t...
What does Python's eval() do?
...g you have a unix system). Using eval() is a security hole. If you need to convert strings to other formats, try to use things that do that, like int().
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IntelliJ beginning of file keyboard shortcut
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To select a block quickly: SHIFT-FN-CMD + UP/DOWN ARROW KEYS .. this solution got me on the right path - thanks!
– Gene Bo
Apr 14 '15 at 19:05
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difference between primary key and unique key
...ey, unique key, etc are collectively called as Candidate Key.
However, DBA selected a key from candidate key for searching records is called Primary key.
Difference between Primary Key and Unique key
1. Behavior: Primary Key is used to identify a row (record) in a table, whereas Unique-key is to...
Get dimension from XML and set text size in runtime
...ur phone screen density is obviously hdpi (240dpi) so it uses 1.5 scale to convert dp to sp. Simple math 18 * 1.5 = 27.
It seems that your tablet density is mdpi (160dpi) so scale is just 1:1.
But if you compare real size of both texts it should be the same.
The best way is just create two dimens...
Spring Boot + JPA : Column name annotation ignored
...implicitly generated from the field name.
The ImprovedNamingStrategy will convert CamelCase to SNAKE_CASE where as the EJB3NamingStrategy just uses the table name unchanged.
If you don't want to change the naming strategy you could always just specify your column name in lowercase:
@Column(name="...
Search for all files in project containing the text 'querystring' in Eclipse
...u at the top, click File..., input your search string, and make sure that 'Selected Resources' or 'Enclosing Projects' is selected, then hit search. The alternative way to open the window is with Ctrl-H. This may depend on your keyboard accelerator configuration.
More details: http://www.ehow.com/h...
How to execute XPath one-liners from shell?
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You should try these tools :
xmlstarlet : can edit, select, transform... Not installed by default, xpath1
xmllint : often installed by default with libxml2-utils, xpath1 (check my wrapper to have --xpath switch on very old releases and newlines delimited output (v < 2.9.9)
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Java Multiple Inheritance
...classes, although those are not so natural to use in Java (you have to use converter methods and so on), this intro might be useful to get the idea: typeclassopedia.bitbucket.org
– Gábor Bakos
Feb 17 '14 at 10:41
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