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# Write (content must be bytes)
sandbox.write_file("/tmp/hello.txt", b"Hello!").result()

# Read (returns bytes)
content = sandbox.read_file("/tmp/hello.txt").result()
print(content.decode())
Like exec(), file operations return an OperationRef immediately without waiting for completion. Call .result() when you need the data. This lets you start multiple operations and wait for them together: 
refs = [sandbox.write_file(f"/tmp/{i}.txt", b"data") for i in range(5)]
for ref in refs:
    ref.result()
For parallel upload/download patterns and S3 mounts, see the File operations guide.
Last modified on April 21, 2026