use string concatenation instead of string joining for 2-item f-strings
use string concatenation instead of string joining for 2-item f-strings

da-woods/cython,scoder/cython,da-woods/cython,cython/cython,ChristopherHogan/cython,da-woods/cython,fabianrost84/cython,fabianrost84/cython,da-woods/cython,ChristopherHogan/cython,ChristopherHogan/cython,fabianrost84/cython,c-blake/cython,c-blake/cython,c-blake/cython,fabianrost84/cython,scoder/cython,cython/cython,c-blake/cython,fabianrost84/cython,scoder/cython,scoder/cython,c-blake/cython,cython/cython,cython/cython