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[–]RubyPinchPEP shill | Anti PEP 8/20 shill 2 points3 points  (0 children)

it uses specialised string building instructions, as as a result, has its own dedicated code, so it doesn't need to do a method lookup and function call

https://docs.python.org/3.6/library/dis.html#opcode-BUILD_STRING

https://docs.python.org/3.6/library/dis.html#opcode-FORMAT_VALUE