cpython/Lib/idlelib/config.txt

# IDLE reads several config files to determine user preferences.  This 
# file is the default config file.  When IDLE starts, it will look in
# the following four files in order:
#     config.txt                      the default config file
#     config-[win/unix/mac].txt       the generic platform config file
#     config-[sys.platform].txt       the specific platform config file
#     ~/.idle                         the user config file
# XXX what about Windows?
#
# The last definition of each option is used.  For example, you can
# override the default window size (80x24) by defining width and
# height options in the EditorWindow section of your ~/.idle file
#
# IDLE extensions can be enabled and disabled by adding them to one of
# the config files.  To enable an extension, create a section with the
# same name as the extension, e.g. the [ParenMatch] section below.  To
# disable an extension, either remove the section or add the 'enable'
# option with the value 0.  

[EditorWindow]
width= 80
height= 24
# fonts defined in config-[win/unix].txt

[Colors]
normal-foreground= black
normal-background= white
# These color types are not explicitly defined= sync, todo, stdin
keyword-foreground= #ff7700
comment-foreground= #dd0000
string-foreground= #00aa00
definition-foreground= #0000ff
hilite-foreground= #000068
hilite-background= #006868
break-foreground= #ff7777
hit-foreground= #ffffff
hit-background= #000000
stdout-foreground= blue
stderr-foreground= red
console-foreground= #770000
error-background= #ff7777
cursor-background= black

[SearchBinding]

[AutoIndent]

[AutoExpand]

[FormatParagraph]

#[ZoomHeight]

#[ScriptBinding]    # disabled in favor of ExecBinding

[ExecBinding]

[CallTips]

[ParenMatch]
enable= 0
style= expression
flash-delay= 500
bell= 1
hilite-foreground= black
hilite-background= #43cd80