The "shutil.copyfile" raises a "SameFileError" exception if the src and dts files are the same.

There is no option to allow the same files(like in case of shutil.copytree(dirs_exist_ok=False)).

For example:

import shutil

shutil.copyfile("test.txt", "test.txt")

Output:

>>> python3 test.py 
Traceback (most recent call last):
  File "test.py", line 3, in <module>
    shutil.copyfile("test.txt", "test.txt")
  File "/usr/lib/python3.6/shutil.py", line 104, in copyfile
    raise SameFileError("{!r} and {!r} are the same file".format(src, dst))
shutil.SameFileError: 'test.txt' and 'test.txt' are the same file

You can use try/except.

try:
    shutil.copyfile("test.txt", "test.txt")
except SameFileError:
    pass

Sure, you can use try/except but it would be nice if the "shutil.copyfile" function supports the same files.

If I have many files (more thousand), I don't want to check them with a try/except.

Furthermore if I want to cover the unexpected exceptions as well I need to use nested try/except (I guess it's not the most elegant way).

Eg.:

try:
    shutil.copyfile("test.txt", "test.txt")
except SameFileError:
    pass
except Exception as unexpected_exception:
    raise unexpected_exception

Could you somebody review the PR for this ticket, please?