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import os
import json
from json.decoder import JSONDecodeError

dirname = "tmp"
for filename in os.listdir(dirname):
    full_filename = os.path.join(dirname, filename)
    with open(full_filename, "rb") as f:
        try:
            json.load(f)
        except (JSONDecodeError, UnicodeDecodeError):
            print("removing", full_filename)
            os.remove(full_filename)