Python Repl in Python

Am I right in assuming that the Python shell is coded in Python? If so, where, might one find the source code? If I wanted to write a shell program that did things differently, could I just copy the code to new_shell.py, make a few changes, and then set up a bash alias 'python'='python3 new_shell'?

Copyright Notice：Content Author:「skwarerüt」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/53291685/python-repl-in-python

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