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Modifying a subset of rows in a pandas dataframe

...The df.A==0 expression creates a boolean series that indexes the rows, 'B' selects the column. You can also use this to transform a subset of a column, e.g.: df.loc[df.A==0, 'B'] = df.loc[df.A==0, 'B'] / 2 I don't know enough about pandas internals to know exactly why that works, but the basic is...
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How can I do an UPDATE statement with JOIN in SQL Server?

...oesn't support MERGE): ANSI/ISO: update ud set assid = ( select sale.assid from sale where sale.udid = ud.id ) where exists ( select * from sale where sale.udid = ud.id ); MySQL: update ud u inner join sale s on u.id = s.udid ...
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What does git rev-parse do?

... in plumbing commands as short for "revision" and generally meaning the 40-character SHA1 hash for a commit. The command rev-list for example prints a list of 40-char commit hashes for a branch or whatever. In this case the name might be expanded to parse-a-commitish-to-a-full-SHA1-hash. While the ...
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How can I use swift in Terminal?

... sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer then you can do one of these: xcrun swift lldb --repl As of Xcode 6.1 - typing swift in the terminal launches the REPL as well. ...
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In Angular, I need to search objects in an array

...ById')($scope.fish, fish_id); console.log(found); $scope.selected = JSON.stringify(found); } }]); If there are any questions just let me know. share | improve this answer ...
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Reading Excel files from C#

...ed Properties=Excel 8.0;", fileName); var adapter = new OleDbDataAdapter("SELECT * FROM [workSheetNameHere$]", connectionString); var ds = new DataSet(); adapter.Fill(ds, "anyNameHere"); DataTable data = ds.Tables["anyNameHere"]; This is what I usually use. It is a little different because I u...
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How do I rename a column in a SQLite database table?

...lite.org/images/syntax/alter-table-stmt.gif Example: CREATE TABLE tab AS SELECT 1 AS c; SELECT * FROM tab; ALTER TABLE tab RENAME COLUMN c to c_new; SELECT * FROM tab; db-fiddle.com demo Android Support As of writing, Android's API 27 is using SQLite package version 3.19. Based on the cu...
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LINQ - Left Join, Group By, and Count

...into j1 from j2 in j1.DefaultIfEmpty() group j2 by p.ParentId into grouped select new { ParentId = grouped.Key, Count = grouped.Count(t=>t.ChildId != null) } share | improve this answer ...
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TFS: Updating branch with changes from main

... From Visual Studio, open Source Control Explorer: View | Team Explorer Select your Team Project from Team Explorer, expand it, and double click Source Control In the left-hand pane of Source Control Explorer, select your Team Project. In the right-hand pane, find your mainline branch, right-clic...
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How can I selectively escape percent (%) in Python strings?

... >>> test = "have it break." >>> selectiveEscape = "Print percent %% in sentence and not %s" % test >>> print selectiveEscape Print percent % in sentence and not have it break. ...