大约有 41,000 项符合查询结果（耗时：0.0251秒） [XML]
get list of pandas dataframe columns based on data type
... mean it's not working, that actually means your DataFrame columns weren't cast to the type you think they should be, which can happen for a variety of reasons.
– Marc
Sep 5 '17 at 13:56
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What is the C++ function to raise a number to a power?
...iguous: could be 'pow(double,int)' or 'pow(double,double)' :-/ → cast
– Marvin
Mar 12 '13 at 9:04
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Key existence check in HashMap
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1+ for primitive types as value unnecessary cast is not required using this answer
– Prashant Bhanarkar
Sep 23 '16 at 9:53
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The specified type member 'Date' is not supported in LINQ to Entities Exception
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LINQ to Entities cannot translate most .NET Date methods (including the casting you used) into SQL since there is no equivalent SQL.
The solution is to use the Date methods outside the LINQ statement and then pass in a value. It looks as if Convert.ToDateTime(rule.data).Date is causing the error...
Get object by id()? [duplicate]
... this can be done by ctypes:
import ctypes
a = "hello world"
print ctypes.cast(id(a), ctypes.py_object).value
output:
hello world
If you don't know whether the object is still there, this is a recipe for undefined behavior and weird crashes or worse, so be careful.
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How can I check if a View exists in a Database?
...wName sysname
declare @cmd sysname
DECLARE check_cursor CURSOR FOR
SELECT cast('['+SCHEMA_NAME(schema_id)+'].['+name+']' as sysname) AS viewname
FROM sys.views
OPEN check_cursor
FETCH NEXT FROM check_cursor
INTO @viewName
WHILE @@FETCH_STATUS = 0
BEGIN
set @cmd='select * from '+@viewName
begin ...
Remove/hide a preference from the screen
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I just got the Category as a Preference, no cast, and removed it. Worked.
– Rob
Apr 3 '15 at 1:14
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Function Pointers in Java
...object2, "getClass");
Of course, check all exceptions and add the needed casts.
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How To Change DataType of a DataColumn in a DataTable?
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Consider also altering the return type:
select cast(columnName as int) columnName from table
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How to determine if a number is odd in JavaScript
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@awm - It seems like you don't know JavaScript. You can't cast to boolean with (bool) (that'll give an error) and in any case you don't need to: return value%2 == 0; will do the job since the == operator returns a boolean.
– nnnnnn
Aug 13 '12 a...