<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_file_size(file_path):
 """Returns the size of the file at the specified file path, formatted as a 4-byte unsigned integer bytearray. """


    size = getsize(file_path)

    file_size = bytearray(4)
    pack_into(b"I", file_size, 0, size)

    return file_size