Solve

Python just cast format character to normal, using this site i get the flag in italic and just run the expression in the eval(). Don't be fool with banner() that all

nc dyn.ctf.pearlctf.in 30017
>>> ????
pearl{it_w4s_t00_e4sy}

Original writeup (https://github.com/nghiango1/pearlctf-writeup/tree/main/miscellaneous/b4by_jail).