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Can someone explain the traverse function in Haskell?
I am trying and failing to grok the traverse function from Data.Traversable . I am unable to see its point. Since I come from an imperative background, can someone please explain it to me in terms of an imperative loop? Pseudo-code would be much appreciated. Thanks.
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Why do loggers recommend using a logger per class?
...resort to more reflection tricks to know where the log messages are coming from.
Compare the following:
Log per class
using System.Reflection;
private static readonly ILog _logger =
LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
public void SomeMethod()
{
_logge...
type object 'datetime.datetime' has no attribute 'datetime'
...
>>> import datetime
>>> datetime
<module 'datetime' from '/usr/lib/python2.6/lib-dynload/datetime.so'>
>>> datetime.datetime(2001,5,1)
datetime.datetime(2001, 5, 1, 0, 0)
But, if you import datetime.datetime:
>>> from datetime import datetime
>>&g...
Practical uses of git reset --soft?
...s HEAD, most often updating the branch ref, and only the HEAD.
This differ from commit --amend as:
it doesn't create a new commit.
it can actually move HEAD to any commit (as commit --amend is only about not moving HEAD, while allowing to redo the current commit)
Just found this example of com...
Why (0-6) is -6 = False? [duplicate]
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All integers from -5 to 256 inclusive are cached as global objects sharing the same address with CPython, thus the is test passes.
This artifact is explained in detail in http://www.laurentluce.com/posts/python-integer-objects-implementa...
What is the difference between and ? [duplicate]
Both tags include the content from one page in another.
6 Answers
6
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How to add Options Menu to Fragment in Android
I am trying to add an item to the options menu from a group of fragments.
20 Answers
2...
Change column type from string to float in Pandas
...ataFrame or Series to have. It's very versatile in that you can try and go from one type to the any other.
Basic usage
Just pick a type: you can use a NumPy dtype (e.g. np.int16), some Python types (e.g. bool), or pandas-specific types (like the categorical dtype).
Call the method on the object you ...
How to generate random number with the specific length in python
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To get a random 3-digit number:
from random import randint
randint(100, 999) # randint is inclusive at both ends
(assuming you really meant three digits, rather than "up to three digits".)
To use an arbitrary number of digits:
from random import randin...
Can I use view pager with views (not with fragments)
... Whatever you return, you just make sure that your implementation of isViewFromObject can match the two up, key to view. However, the most common implementation is to just return the view as the key as well. FragmentPageAdapter handles all the key-to-view stuff for you and thus just asks you to cre...