Example of sys.orig_argv usage to re-execute the Python process with different options:
---
import sys
import os
if not sys.flags.utf8_mode:
    # Force UTF-8 mode
    argv = sys.orig_argv.copy()
    argv[1:1] = ["-X", "utf8"]
    print(f"Re-execute to force UTF-8 mode! argv={argv}")
    os.execv(argv[0], argv)

print(f"Everybody loves UTF-8! utf8_mode={sys.flags.utf8_mode}")
---

Example coming from discussions on the PEP 597 :-)

Output:
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$ ./python force_utf8_mode.py 
Re-execute to force UTF-8 mode! argv=['./python', '-X', 'utf8', 'force_utf8_mode.py']
Everybody loves UTF-8! utf8_mode=1
---