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std::function and std::bind: what are they, and when should they be used?
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std::bind is for partial function application.
That is, suppose you have a function object f which takes 3 arguments:
f(a,b,c);
You want a new function object which only takes two arguments, defined as:
g(a,b) := f(a, 4, b);
g is a...
mongodb group values by multiple fields
For example, I have these documents:
3 Answers
3
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How to get name of exception that was caught in Python?
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The other answers here are great for exploration purposes, but if the primary goal is to log the exception (including the name of the exception), perhaps consider using logging.exception instead of print?
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What is a clean, pythonic way to have multiple constructors in Python?
I can't find a definitive answer for this. As far as I know, you can't have multiple __init__ functions in a Python class. So how do I solve this problem?
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How to apply a function to two columns of Pandas dataframe
... Added an example to my answer, hope this does what you're looking for. If not, please provide a more specific example function since sum is solved successfully by any of the methods suggested so far.
– Aman
Nov 12 '12 at 14:51
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What is __future__ in Python used for and how/when to use it, and how it works
...uently appears in Python modules. I do not understand what __future__ is for and how/when to use it even after reading the Python's __future__ doc .
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std::vector performance regression when enabling C++11
I have found an interesting performance regression in a small C++ snippet, when I enable C++11:
1 Answer
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What's the UIScrollView contentInset property for?
... to me what the contentInset property in a UIScrollView instance is used for? And maybe provide an example?
5 Answers
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Can a dictionary be passed to django models on create?
...lled MyModel:
# create instance of model
m = MyModel(**data_dict)
# don't forget to save to database!
m.save()
As for your second question, the dictionary has to be the final argument. Again, extra and extra2 should be fields in the model.
m2 =MyModel(extra='hello', extra2='world', **data_dict)
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How to process SIGTERM signal gracefully?
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Thanks for the idea! I used a modified approach in reboot-guard. github.com/ryran/reboot-guard/blob/master/rguard#L284:L304
– rsaw
Sep 6 '15 at 15:28
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