QUESTION: I really appreciate in advance, shell written in python3 language. Better to solve this question steps by steps.

Restrictions You are limited to using the following Python modules os (excluding the os system function) Sys e time You must not use Python features such as the "os. system" function or the bprocess module to directly execute commands within the system shell. The purpose of this assignment is to emulate how the shell works, rather than write a in Python, not by launching a bash subprocess) If you have any questions regarding the scope of these restrictions, please ask on Python interface for the command line &e buitin commands should be implemented Ed basic command loop . reading line continuations . builtins . using variables . i/o redirection . exec-ing external commands e exec-ing with correct i/o redirection e pipes e code layout, readability, overall quality, etc Restrictions You are limited to using the following Python modules os (excluding the os system function) Sys e time You must not use Python features such as the "os. system" function or the bprocess module to directly execute commands within the system shell. The purpose of this assignment is to emulate how the shell works, rather than write a in Python, not by launching a bash subprocess) If you have any questions regarding the scope of these restrictions, please ask on Python interface for the command line &e buitin commands should be implemented Ed basic command loop . reading line continuations . builtins . using variables . i/o redirection . exec-ing external commands e exec-ing with correct i/o redirection e pipes e code layout, readability, overall quality, etc