[Python] Click: How to propagate the exit code back to the group

I have a script which use click.group to provide sub commands. Each of the sub command might pass or fail. How do I propagate the exit code from the sub commands back to main?

import click
import sys

@click.group()
def main():
# How do I get the exit code from `get`?
sys.exit(0) # use that exit code here


@main.command()
def get():
exit_code = 1
# How do I send the exit code back to main?

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