How long does it take Python to write lots of data to file on disk?

writebench.py

"""
$ python3 writebench.py
Wrote 4768.42 MB in 2.30 secs

"""
import os
import tempfile
import time

t0 = time.time()

with tempfile.NamedTemporaryFile(delete=False) as f:
    for i in range(1000 * 100):
        f.write(b'x' * i + b'\n')

size = os.path.getsize(f.name) / 1024 / 1024
elapsed = time.time() - t0

print('Wrote {0:.2f} MB in {1:.2f} secs'.format(size, elapsed))

os.remove(f.name)