Augmented assignment augmentation?

[Manus Hand]

Call me crazy, call it late at night, or both, but here goes....

Yes, I know that the vast majority of class methods don't return
an instance of that method, far different from the but....

With the addition of methods to the string class, I have changed
all of my code that was formerly:
   line = string.upper(line)
to:
   line = line.upper()

Well, with augmented assignment, I was thinking that one lookup
of the string could be avoided if augmented assignment was
augmented by adding the a "method call assignment" operator .=

So that:
   line = line.upper()
could be written:
   line .= upper()

Next I'll want "slice assignment":
   word = word[2:]
would be rewritable as:
   word [= 2:]

:-)

Don't jump me -- I'm (half?) wishing I could date this posting
April 1st.  :-)

Foolish'ly yours,
Manus