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Prepend a level to a pandas MultiIndex
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A nice way to do this in one line using pandas.concat():
import pandas as pd
pd.concat([df], keys=['Foo'], names=['Firstlevel'])
An even shorter way:
pd.concat({'Foo': df}, names=['Firstlevel'])
This can be generalized to many data frames, see the docs.
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Counting the Number of keywords in a dictionary in python
...t)
If you like to count unique words in the file, you could just use set and do like
len(set(open(yourdictfile).read().split()))
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How to get an object's property's value by property name?
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Sure
write-host ($obj | Select -ExpandProperty "SomeProp")
Or for that matter:
$obj."SomeProp"
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Using C# to check if string contains a string in string array
... Thanks, I modified your code to: if (stringToCheck.Contains(s)) and it worked.
– Theomax
May 26 '10 at 13:29
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JavaScript hard refresh of current page
...page via JavaScript?
Hard refresh means getting a fresh copy of the page AND refresh all the external resources (images, JavaScript, CSS, etc.).
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Restart/undo conflict resolution in a single file
...This restores the unresolved state, including all information about parent and merge base, which allows restarting the resolution.
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Java int to String - Integer.toString(i) vs new Integer(i).toString()
...t is to print an int, you'd use the first one because it's lighter, faster and doesn't use extra memory (aside from the returned string).
If you want an object representing an integer value—to put it inside a collection for example—you'd use the second one, since it gives you a full-fledged o...
How to hide columns in HTML table?
...@Anuraj it should be noted that :first-child etc. are supported > IE 11 and Edge, good one anyway
– Vitaliy Terziev
Jul 26 '17 at 9:41
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Why can I use auto on a private type?
I was somehow surprised that the following code compiles and runs (vc2012 & gcc4.7.2)
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Center a button in a Linear layout
...It has 1 button that is supposed to centre in the screen both horizontally and vertically. However no matter what I try to do the button will top align centre. I have included the XML below, can some one point me in the right direction?
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