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How to select rows from a DataFrame based on column values?
How to select rows from a DataFrame based on values in some column in Pandas?
10 Answers
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How to deal with SettingWithCopyWarning in Pandas?
...owing, which does not always work as expected, particularly when the first selection returns a copy. [see GH5390 and GH5597 for background discussion.]
df[df['A'] > 2]['B'] = new_val # new_val not set in df
The warning offers a suggestion to rewrite as follows:
df.loc[df['A'] > 2, 'B'] =...
How to add reference to a method parameter in javadoc?
...ass:
/**
* Allocates a new <code>String</code> that contains characters from
* a subarray of the character array argument. The <code>offset</code>
* argument is the index of the first character of the subarray and
* the <code>count</code> argument specifies t...
Delete all but the most recent X files in bash
... but the 5 last lines (ie the 5 newest files).
xargs rm calls rm for each selected file.
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Hide the cursor of an UITextField
...o that when the user taps the text field, a picker is summoned for them to select an option from.
13 Answers
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Under what circumstances are linked lists useful?
...s contained within the object that's a list element - whether as part of a union (in C terms) or not. Point 3 only applies in languages that let you do it - C, C++, assembler good. Java bad.
– Steve Jessop
Mar 12 '10 at 1:01
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How to determine whether code is running in DEBUG / RELEASE build?
...processor Macros' for debug to ensure that DEBUG is being set - do this by selecting the project and clicking on the build settings tab. Search for DEBUG and look to see if indeed DEBUG is being set.
Pay attention though. You may see DEBUG changed to another variable name such as DEBUG_MODE.
th...
What XML parser should I use in C++? [closed]
...what library you should use depends on your needs. Here's a convenient flowchart:
So the first question is this: What do you need?
I Need Full XML Compliance
OK, so you need to process XML. Not toy XML, real XML. You need to be able to read and write all of the XML specification, not just the low-l...
How to find the mysql data directory from command line in windows
... the following command line:
mysql -s -N -uUSER -p information_schema -e 'SELECT Variable_Value FROM GLOBAL_VARIABLES WHERE Variable_Name = "datadir"'
The command will select the value only from mysql's internal information_schema database and disables the tabular output and column headers.
Outp...
Does Java have something like C#'s ref and out keywords?
...his should be expanded on some. You can only pass primitives (int, short, char, etc.) as value. And no, there is no out.
– Corey Sunwold
May 10 '10 at 21:26
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