PEP 465 introduced the infix operator @: https://www.python.org/dev/peps/pep-0465/ https://www.python.org/dev/peps/pep-0465/ Python 3.5 was the first version o

PEP 465 introduced the infix operator @: https://www.python.org/dev/peps/pep-0465/ https://www.python.org/dev/peps/pep-0465/ Python 3.5 was the first version of python3 to implement the PEP: https://docs.python.org/3.5/whatsnew/3.5.html https://docs.python.org/3.5/whatsnew/3.5.html If I am reading the release notes correctly, Python 3.5.0 was released last year (2015-09-13): https://www.python.org/downloads/release/python-350/ https://www.python.org/downloads/release/python-350/ It's fair to say that this is a relatively new development.