cpython/Tools/idle/help.txt

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Windows and files:
^X ^N creates new empty text editor window
^X ^C closes all windows
Alt-F4 or ^X ^0 (that's control-x-control-zero) closes current window
^X ^D opens a file from dialog box
^X ^S saves to current file
^X ^W saves to file from dialog box
^X w save a copy to file from dialog box
Navigation:
Arrow keys and Page Up/Down to move around
Home/End go to begin/end of line
Control-Home/End go to begin/end of file
Some Emacs bindings may also work, e.g. ^A/^E
Searching: all searches are forward from the cursor without
wrap-around, case sensitive, Perl-style regular expression matches
^S without a selection opens search dialog box
^S with a selection searches for selected text
^U ^S repeats last search
Alt-G opens dialog box to go to a specific line
Editing:
Backspace deletes left of cursor, Delete right of cursor
Cut and paste use platform's conventions
^[ or Alt-[ left-shifts (dedents) the current line or selection
^] or Alt-] right-shifts (indents) the current line or selection
Alt-/ expands last word you type (like Emacs dabbrev)
Undo:
^Z undoes last change; repeat to undo more
Alt-Z redoes last undone change; repeat to redo more
Console window:
^C interrupts executing command
^D sends end-of-file; closes console if typed at >>> prompt
If you get a traceback, right-click on any line listing a
filename and line number and select "Go to line from
traceback" to open that file and go to the indicated line
Python syntax colors: the coloring is applied in a background thread
Keywords orange
Strings green
Comments red
Definitions blue
Console colors:
Console output red
stdout blue
stderr dark green
stdin purple