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how do you filter pandas dataframes by multiple columns
To filter a dataframe (df) by a single column, if we consider data with male and females we might:
6 Answers
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Display / print all rows of a tibble (tbl_df)
...anipulation package in R. It prevents long table outputs when accidentally calling the data frame.
7 Answers
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How to copy data to clipboard in C#
...ation, make sure Main is marked with [STAThread] attribute. Step-by-step guide in another answer
using System.Windows.Forms;
To copy an exact string (literal in this case):
Clipboard.SetText("Hello, clipboard");
To copy the contents of a textbox either use TextBox.Copy() or get text first and...
Resize image proportionally with MaxHeight and MaxWidth constraints
...
Like this?
public static void Test()
{
using (var image = Image.FromFile(@"c:\logo.png"))
using (var newImage = ScaleImage(image, 300, 400))
{
newImage.Save(@"c:\test.png", ImageFormat.Png);
}
}
public static Image ScaleImage(I...
Selecting with complex criteria from pandas.DataFrame
...0 700
7 2 80 400
8 5 80 300
9 7 70 800
Note that I accidentally typed == 900 and not != 900, or ~(df["C"] == 900), but I'm too lazy to fix it. Exercise for the reader. :^)
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Changing the size of a column referenced by a schema-bound view in SQL Server
...ngth to add the schemabindig to prevent table changes. This is not some accident, looks like the person know what was doing. Are you sure you want to change the table?
– Remus Rusanu
Aug 24 '09 at 5:59
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How do I pull files from remote without overwriting local files?
...ell, yes, and no...
I understand that you want your local copies to "override" what's in the remote, but, oh, man, if someone has modified the files in the remote repo in some different way, and you just ignore their changes and try to "force" your own changes without even looking at possible confl...
Postgresql - unable to drop database because of some auto connections to DB
...t_database() AND pid <> pg_backend_pid();
On older versions pid was called procpid so you'll have to deal with that.
Since you've revoked CONNECT rights, whatever was trying to auto-connect should no longer be able to do so.
You'll now be able to drop the DB.
This won't work if you're using s...
Why does ~True result in -2?
...is not surprising if True means 1 and ~ means bitwise inversion...
...provided that
True can be treated as an integer and
integers are represented in Two's complement
Edits:
fixed the mixing between integer representation and bitwise inversion operator
applied another polishing (the shorte...
Format a date using the new date time API
...nally parsing delegates to the target type (here: LocalDate) and let it decide if it accepts all the field values in parsed intermediate object.
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