Exclusively create a new binary file in python 2, like 'x' mode in python 3

create_new_file_python2.py

#!/usr/bin/python2
# -*- coding: utf-8 -*-
"""
>>> f1 = create_file('/tmp/test.bin')
>>> f2 = create_file('/tmp/test.bin')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in create_file
OSError: [Errno 17] File exists: '/tmp/test.bin'
>>> f1.close()
>>> os.unlink('/tmp/test.bin')
"""
import os

def create_file(file_path):
    """Create a new file, like the 'x' file mode in python 3

    See https://alexwlchan.net/2016/03/exclusive-create-python/ for how to use
    """
    fd = os.open(file_path, os.O_RDWR | os.O_CREAT | os.O_EXCL, 0o644)
    return os.fdopen(fd, 'wb')