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Changing a specific column name in pandas DataFrame
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362
A one liner does exist:
In [27]: df=df.rename(columns = {'two':'new_name'})
In [28]: df
Out[28...
How to get the error message from the error code returned by GetLastError()?
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//Returns the last Win32 error, in string format. Returns an empty string if there is no error.
std::string GetLastErrorAsString()
{
//Get the error message, if any.
DWORD errorMessageID = ::GetLastError();
if(errorMessageID == 0)
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In a javascript array, how do I get the last 5 elements, excluding the first element?
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362
You can call:
arr.slice(Math.max(arr.length - 5, 1))
If you don't want to exclude the first e...
How do I prevent an Android device from going to sleep programmatically?
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eldarerathiseldarerathis
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What is the purpose of the word 'self'?
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24 Answers
24
Active
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PostgreSQL - fetch the row which has the Max value for a column
...id, time_stamp))
Bill's query has a cost estimate of 93k, and completes in 2.9 seconds (given a compound index on (usr_id, trans_id))
Query #1 below has a cost estimate of 16k, and completes in 800ms (given a compound index on (usr_id, trans_id, time_stamp))
Query #2 below has a cost estimate of 14k...
Can I install the “app store” in an IOS simulator?
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121
This is NOT possible
The Simulator does not run ARM code, ONLY x86 code. Unless you have the r...
What does rake db:test:prepare actually do?
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answered Mar 2 '13 at 2:26
Richard BrownRichard Brown
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SQL Server 2008 can't login with newly created user
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edited Nov 21 '12 at 5:16
Bobrovsky
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