[Python-Dev] readd u'' literal support in 3.3? (original) (raw)

Serhiy Storchaka storchaka at gmail.com
Wed Dec 14 00:16:34 CET 2011

14.12.11 00:38, Nick Coghlan написав(ла):

String translation is also an open question. For some codebases, you want both u"" and "" to translate to a Unicode "" (either in Py3k or via the future import), but if a code base deals with WSGI-style native strings (by means of u"" for text, "" for native, b"" for binary), then the more appropriate translation is to use the future import and map them to "", str("") and b"" respectively.

There are other place for native strings -- sys.argv.

if sys.argv[1] == str('-'): f = sys.stdin else: f = open(sys.argv[1], 'r')

Yet another pitfall -- sys.stdin is bytes stream in 2.x and text stream in 3.x. For reading binary data:

if sys.argv[1] == str('-'): if sys.version_info[0] >= 3: f = sys.stdin.buffer.raw else: f = sys.stdin else: f = open(sys.argv[1], 'r')

Reading text data is even more complicated in Python 2.x.

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