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What means "<<" in dependencies at packages.debian.org?

Example: https://packages.debian.org/sid/python3-kivy

  • dep: python3 (<< 3.7)
    dep: python3 (>= 3.5~)
  • The ">=" surely means "greater than or equal to", but what is "<<"? "less than or less than"?

    Even more interesting is that "aptitude install python3-kivy" only shows one "<" (which makes sense to me as "less than"):

    The following packages have unmet dependencies:
     python3-kivy : Depends: python3 (< 3.7) but 3.7.2-1 is installed

    and in the description of the package in the aptitude console:

    Depends: python3-gst-1.0, python3 (< 3.7), python3 (>= 3.5~), ...

    It's not a typo, unless other pages have similar typos (sometimes being ">>" - "greater than or greater than"?).

    Also, is the answer documented somewhere? I've researched unproductively for several hours.


    Kent West                    <")))><
    Westing Peacefully - http://kentwest.blogspot.com