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Algorithm to find Largest prime factor of a number
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Please read and/or run this code before voting it down. It works fine. Just copy and paste. As written prime_factors(1000) will return [2,2,2,5,5,5], which should be interpreted as 2^3*5^3, a.k.a. the prime factorization.
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Finding the index of an item in a list
...e list, you should either
Check for it first with item in my_list (clean, readable approach), or
Wrap the index call in a try/except block which catches ValueError (probably faster, at least when the list to search is long, and the item is usually present.)
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Create a GUID in Java
...iePet Eh, if you're that paranoid, and you got access to the list of the already-used IDs when creating a new one, you just generate new ones in a while until you got one that isn't inside your list :p
– Nyerguds
Jul 5 '16 at 13:11
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Creating an R dataframe row-by-row
... use tend to multiply storage by 2 when extending allocation. I thought I read in R Internals that there is a memory structure where the storage increments by 20%. Either way, growth operations occur with logarithmic frequency relative to the total number of elements appended. On an amortized bas...
How to make a class JSON serializable
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@user5359531 you can use obj = jsonpickle.decode(file.read()) and file.write(jsonpickle.encode(obj)).
– Kilian Batzner
Jan 2 '17 at 8:04
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if A vs if A is not None:
... what you really want to check. These things can be hard to debug since is reads like prose that we often just skim over it.
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Can anybody push to my project on github?
...esh the page, I can see the changes are uploaded(for example, if I wrote a readme.txt and push it to the remote repo, where such a readme.txt did not exist, after push and refresh the page, it appears).
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Python Image Library fails with message “decoder JPEG not available” - PIL
...d libjpeg installed systemwide:
libpng & libjpeg for OSX
Because I already had PIL installed (via pip on a virtualenv), I ran:
pip uninstall PIL
pip install PIL --upgrade
This resolved the decoder JPEG not available error for me.
UPDATE (4/24/14):
Newer versions of pip require additional ...
Usage of forceLayout(), requestLayout() and invalidate()
...ve no effect since it does not trigger a requestLayout() up the view tree.
Read this Q&A for a more detailed description of forceLayout().
Further study
Creating a View Class: Add Properties and Events (helpful docs)
View documentation
View source code
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Java “user.dir” property - what exactly does it mean?
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Already read it before posting. But "User working directory" is not a best explanation, hope you agree.
– johnny-b-goode
Apr 26 '13 at 14:53
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