Serhiy Storchaka added the comment:
Tk supports alpha only for photo images and as an attribute of top-level
window. It doesn't support alpha component in colors.
The desired color is specified with an object whose string value
must have one of the following forms:
colorname Any of the valid textual names for a color defined
in the server's color database file, such as red or
PeachPuff.
#RGB
#RRGGBB
#RRRGGGBBB
#RRRRGGGGBBBB A numeric specification of the red, green, and blue
intensities to use to display the color. Each R,
G, or B represents a single hexadecimal digit. The
four forms permit colors to be specified with
4-bit, 8-bit, 12-bit or 16-bit values. When fewer
than 16 bits are provided for each color, they rep-
resent the most significant bits of the color,
while the lower unfilled bits will be repeatedly
replicated from the available higher bits. For
example, #3a7 is the same as #3333aaaa7777.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20920>
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