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What is the rationale for all comparisons returning false for IEEE754 NaN values?
...wever, there is a similar property that does hold. Clause 5.11, paragraph 2 of the 754-2008 standard:
Four mutually exclusive relations are possible: less than, equal, greater than, and unordered. The last case arises when at least one operand is NaN. Every NaN shall compare unordered with ever...
Does Python have a ternary conditional operator?
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26 Answers
26
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PostgreSQL: Difference between text and varchar (character varying)
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792
There is no difference, under the hood it's all varlena (variable length array).
Check this art...
How to re-raise an exception in nested try/except blocks?
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132
As of Python 3 the traceback is stored in the exception, so a simple raise e will do the (mostly...
Removing elements by class name?
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edited Apr 6 '19 at 14:32
answered Jan 23 '11 at 22:52
Li...
What do single quotes do in C++ when used on multiple characters?
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285
It's a multi-character literal. 1952805748 is 0x74657374, which decomposes as
0x74 -> 't'
0...
Dump a NumPy array into a csv file
Is there a way to dump a NumPy array into a CSV file? I have a 2D NumPy array and need to dump it in human-readable format.
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Add list to set?
Tested on Python 2.6 interpreter:
12 Answers
12
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Configure Microsoft.AspNet.Identity to allow email address as username
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Select statement to find duplicates on certain fields
...lds for which there are multiple records, you can use..
select field1,field2,field3, count(*)
from table_name
group by field1,field2,field3
having count(*) > 1
Check this link for more information on how to delete the rows.
http://support.microsoft.com/kb/139444
There should be a criterion...