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Multiple aggregations of the same column using pandas GroupBy.agg()
... functions f1, f2 to the same column df["returns"] , without having to call agg() multiple times?
3 Answers
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How do I find the install time and date of Windows?
...estion, but how can I find out (hopefully via an API/registry key) the install time and date of Windows?
19 Answers
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SQLAlchemy: how to filter date field?
...In fact, your query is right except for the typo: your filter is excluding all records: you should change the <= for >= and vice versa:
qry = DBSession.query(User).filter(
and_(User.birthday <= '1988-01-17', User.birthday >= '1985-01-17'))
# or same:
qry = DBSession.query(User)....
MongoDB not equal to
...b.inventory.find( { price: { $not: { $gt: 1.99 } } } )
That would select all documents where:
The price field value is less than or equal to 1.99 or the price
Field does not exist
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impro...
Standard deviation of a list
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The functions are actually called stdev and pstdev, not using std for standard as one would expect. I couldn't edit the post as edits need to modify at least 6 chars...
– mknaf
Jan 6 '17 at 16:00
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How to drop column with constraint?
...'alter table tbloffers drop constraint ['+dc.NAME+N']'
from sys.default_constraints dc
JOIN sys.columns c
ON c.default_object_id = dc.object_id
WHERE
dc.parent_object_id = OBJECT_ID('tbloffers')
AND c.name = N'checkin'
IF @@ROWCOUNT = 0 BREAK
EXEC (@sql)
END
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Read entire file in Scala?
...simple and canonical way to read an entire file into memory in Scala? (Ideally, with control over character encoding.)
18 ...
How does the @property decorator work in Python?
...is just syntactic sugar; the syntax:
@property
def foo(self): return self._foo
really means the same thing as
def foo(self): return self._foo
foo = property(foo)
so foo the function is replaced by property(foo), which we saw above is a special object. Then when you use @foo.setter(), what you ...
How do I calculate square root in Python?
...ethod can be computed as: sqrt = x**(float(1)/2)
– VM_AI
Sep 28 '18 at 10:41
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How can I convert byte size into a human-readable format in Java?
...fact: The original snippet posted here was the most copied Java snippet of all time on Stack Overflow, and it was flawed. It was fixed, but it got messy.
Full story in this article: The most copied Stack Overflow snippet of all time is flawed!
Source: Formatting byte size to human readable format |...