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[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
These few keyboard shortcuts allow the user to perform all the basic editing operations, and the keys are clustered at the left end of the bottom row of the standard QWERTY keyboard. These are the standard shortcuts: Control-Z (or ⌘ Command+Z) to undo; Control-X (or ⌘ Command+X) to cut; Control-C (or ⌘ Command+C) to copy
Larry Tesler created the concept of cut, copy, paste, and undo for human-computer interaction while working at Xerox PARC to control text editing.During the development of the Macintosh it was decided that the cut, paste, copy and undo would be used frequently and assigned them to the ⌘-Z (Undo), ⌘-X (Cut), ⌘-C (Copy), and ⌘-V (Paste).
Move to beginning of line Home: Home: Ctrl+A. or Home. Move to end of line End: End: Ctrl+E. or End. Reverse search of history F8: F8: Ctrl+R: Pause execution of the current job Ctrl+Z: Insert the next character typed verbatim Ctrl+V: Autocomplete command/file name Tab ↹ (enabled by default in Windows XP and later) Tab ↹: Tab ↹ (usually ...
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Moves the cursor left (but may "backwards wrap" if cursor is at start of line). ^I: 0x09: HT: Tab: Moves the cursor right to next tab stop. ^J: 0x0A: LF: Line Feed: Moves to next line, scrolls the display up if at bottom of the screen. Usually does not move horizontally, though programs should not rely on this. ^L: 0x0C: FF: Form Feed: Move a ...
Some codecs will analyze a longer segment, called a frame, of the data to optimize efficiency, and then code it in a manner that requires a larger segment of data at one time to decode. The inherent latency of the coding algorithm can be critical; for example, when there is a two-way transmission of data, such as with a telephone conversation ...
The loop body is executed "for" the given values of the loop variable. This is more explicit in ALGOL versions of the for statement where a list of possible values and increments can be specified. In Fortran and PL/I, the keyword DO is used for the same thing and it is named a do-loop; this is different from a do while loop.