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Selecting with complex criteria from pandas.DataFrame
...; from random import randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9)*100 for x in range(10)]})
>>> df
A B C
0 9 40 300
1 9 70 700
2 5 70 90...
Python memoising/deferred lookup property decorator
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12
For all sorts of great utilities I'm using boltons.
As part of that library you have cachedpro...
Getting multiple keys of specified value of a generic Dictionary?
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15 Answers
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Python: Select subset from list based on index set
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126
You could just use list comprehension:
property_asel = [val for is_good, val in zip(good_obje...
What is the difference between linear regression and logistic regression?
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15 Answers
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How to make blinking/flashing text with CSS 3
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10 Answers
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Unique Key constraints for multiple columns in Entity Framework
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With Entity Framework 6.1, you can now do this:
[Index("IX_FirstAndSecond", 1, IsUnique = true)]
public int FirstColumn { get; set; }
[Index("IX_FirstAndSecond", 2, IsUnique = true)]
public int SecondColumn { get; set; }
The second parameter in ...
RuntimeWarning: invalid value encountered in divide
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157
I think your code is trying to "divide by zero" or "divide by NaN". If you are aware of that a...
Alternate FizzBuzz Questions [closed]
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14 Answers
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switch() statement usage
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120
Well, timing to the rescue again. It seems switch is generally faster than if statements.
So t...