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Best way to merge two maps and sum the values of same key?
...p is just a set of values, together with an operator that takes two values from that set, and produces another value from that set. So integers under addition are a semigroup, for example - the + operator combines two ints to make another int.
You can also define a semigroup over the set of "all m...
How do you calculate the average of a set of circular data? [closed]
...erage of a set of circular data. For example, I might have several samples from the reading of a compass. The problem of course is how to deal with the wraparound. The same algorithm might be useful for a clockface.
...
When saving, how can you check if a field has changed?
...
I use following mixin:
from django.forms.models import model_to_dict
class ModelDiffMixin(object):
"""
A model mixin that tracks model fields' values and provide some useful api
to know what fields have been changed.
"""
def ...
Entity Framework Code First - Advantages and disadvantages of Fluent Api vs Data Annotations [closed
...tity Framework code-first, a lot of the database model is can be extracted from the code. Fluent API and/or Attributes can be used to fine tune the model.
...
Is it expensive to use try-catch blocks even if an exception is never thrown?
... stack and seeing if any try blocks exist that would catch this exception. From a layman's perspective, try may as well be free. It's actually throwing the exception that costs you - but unless you're throwing hundreds or thousands of exceptions, you still won't notice the cost.
try has some mino...
Integrated Markdown WYSIWYG text editor
...nto the <div>. The copying runs through Showdown which produces HTML from Markdown.
Another Javascript routine reacts every time the <div> contents change. It copies the contents back into the (now hidden) <textarea>. The content is run through to-markdown to convert from HTML to M...
What is the simplest and most robust way to get the user's current location on Android?
... example, may not be enough for GPS so you can enlarge it.
If I get update from location listener I use the provided value. I stop listeners and timer.
If I don't get any updates and timer elapses I have to use last known values.
I grab last known values from available providers and choose the most ...
grunt: command not found when running from terminal
...all morning.
I was running the command "npm install -g grunt-cli" command from within a directory where my project was.
I tried again from my home directory (i.e. 'cd ~') and it installed as before, except now I can run the grunt command and it is recognised.
...
How do I protect Python code? [closed]
...that a criminal offense.
Since no technical method can stop your customers from reading your code, you have to apply ordinary commercial methods.
Licenses. Contracts. Terms and Conditions. This still works even when people can read the code. Note that some of your Python-based components may re...
How to find the mime type of a file in python?
...ike this.
# For MIME types
import magic
mime = magic.Magic(mime=True)
mime.from_file("testdata/test.pdf") # 'application/pdf'
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