"""
Using a dictionary for open files.

The file is filled with NULL. Only the last entry is normal.

Result:
00 00 00 00 ... 00 0A 48 65 6C 6C 6F 0A

Ubuntu - 3.8.10
Windows - 3.9.8
"""
fhandles = {}
for f in range(100):
    fh = fhandles.setdefault("suffix", open(r"test.txt", "w"))
    fh.write("\nHello\n")
    fh.flush()
for f in fhandles.values():
    f.close()

import sys
print(sys.version_info)