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>>> import errno
>>> os.link(fileA, fileB)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: [Errno 17] File exists
>>> try:
...     os.link(fileA, fileB)
... except OSError, err:
...     print err.errno
... 
17
>>> print errno.EACCES
13
>>> print errno.EEXIST
17

https://docs.python.org/2/library/errno.html

>>> import os
>>> fileA = '/backup/dbC/lock_files/backup_running'
>>> fileB = '/backup/dbC/lock_files/si_bkp_ongoing'
>>> os.lstat(fileA).st_ino
400071
>>> os.lstat(fileB).st_ino
412219
>>> os.remove(fileB)

>>> os.link(fileA, fileB)
>>> os.lstat(fileA).st_ino
400071
>>> os.lstat(fileB).st_ino
400071