[Python] f string formatting not working as intended [duplicate]

I'm fairly new to Python and need some advise,

os.system(f"find {files_local} -type f -exec chmod 0644 {} \;")


this line doesn't work because of the empty {}

os.system(f"find {files_local} -type f -exec chmod 0644 {} \;")


SyntaxError: f-string: valid expression required before '}'


What work around I could use?

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