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Determine the number of NA values in a column
...r of NA values in a data frame column. Say my data frame is called df , and the name of the column I am considering is col . The way I have come up with is following:
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Getting the first index of an object
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As Ben Alpert points out, properties of Javascript objects are unordered, and your code is broken if you expect them to enumerate in the same order that they are specified in the object literal—there is no "first" property.
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How to set downloading file name in ASP.NET Web API
...e.ContentDisposition or ContentDispositionHeaderValue? Is one more current and more preferred than the other?
– Luminous
May 8 '15 at 16:00
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ImportError: No module named pip
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OMG thank you! I have a vagrant box spun up with python 3 and was wondering why pip commands where not working when I installed pip via 'sudo apt-get install python-pip'. These versioning changes (i.e. like php with homebrew) drive me crazy sometimes...
– Ryan ...
Git: See my last commit
...s noted by other folks in this question, you can use git log -1, git show, and git diff to get the same sort of output. Personally, I tend to use git show <rev> when looking at individual revisions.
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numpy: most efficient frequency counts for unique values in an array
...p.array([1,1,1,2,2,2,5,25,1,1])
y = np.bincount(x)
ii = np.nonzero(y)[0]
And then:
zip(ii,y[ii])
# [(1, 5), (2, 3), (5, 1), (25, 1)]
or:
np.vstack((ii,y[ii])).T
# array([[ 1, 5],
[ 2, 3],
[ 5, 1],
[25, 1]])
or however you want to combine the counts and the uni...
Get the key corresponding to the minimum value within a dictionary
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what if two different keys have the same value? and they happen to both be the smallest value? how can you make it return both?
– user3226932
Dec 18 '16 at 4:29
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Get the data received in a Flask request
...ing request data as string in case it came with a mimetype Flask does not handle.
request.args: the key/value pairs in the URL query string
request.form: the key/value pairs in the body, from a HTML post form, or JavaScript request that isn't JSON encoded
request.files: the files in the body, whi...
How to send a custom http status message in node / express?
... is the correct way to set the statusMessage to something other than the standard message mapped to the StatusCode
– peteb
May 13 '16 at 18:38
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Converting 'ArrayList to 'String[]' in Java
...tring> list = new ArrayList<String>();
//add some stuff
list.add("android");
list.add("apple");
String[] stringArray = list.toArray(new String[0]);
The toArray() method without passing any argument returns Object[]. So you have to pass an array as an argument, which will be filled with th...