Olive wrote: > In Unix the operating system pass argument as a list of C strings. But > C strings does corresponds to the bytes notions of Python3. Is it > possible to have sys.argv as a list of bytes ? What happens if I pass > to a program an argumpent containing funny "character", for example > (with a bash shell)? > > python -i ./test.py $'\x01'$'\x05'$'\xFF'
Python has a special errorhandler, "surrogateescape" to deal with bytes that are not valid UTF-8. If you try to print such a string you get an error: $ python3 -c'import sys; print(repr(sys.argv[1]))' $'\x01'$'\x05'$'\xFF' '\x01\x05\udcff' $ python3 -c'import sys; print(sys.argv[1])' $'\x01'$'\x05'$'\xFF' Traceback (most recent call last): File "<string>", line 1, in <module> UnicodeEncodeError: 'utf-8' codec can't encode character '\udcff' in position 2: surrogates not allowed It is still possible to get the original bytes: $ python3 -c'import sys; print(sys.argv[1].encode("utf-8", "surrogateescape"))' $'\x01'$'\x05'$'\xFF' b'\x01\x05\xff' -- http://mail.python.org/mailman/listinfo/python-list