On Fri, Jan 26, 2018 at 12:42 AM, INADA Naoki <songofaca...@gmail.com> wrote:
> Currently, int(), str.isdigit(), str.isalnum(), etc... accepts > non-ASCII strings. > > >>> s = 123" > >>> s > '123' > >>> s.isdigit() > True > >>> print(ascii(s)) > '\uff11\uff12\uff13' > >>> int(s) > 123 > > But sometimes, we want to accept only ascii string. For example, > ipaddress module uses: > > _DECIMAL_DIGITS = frozenset('0123456789') > ... > if _DECIMAL_DIGITS.issuperset(str): > > ref: https://github.com/python/cpython/blob/e76daebc0c8afa3981a4c5a8b54537 > f756e805de/Lib/ipaddress.py#L491-L494 > > If str has str.isascii() method, it can be simpler: > > `if s.isascii() and s.isdigit():` > > I want to add it in Python 3.7 if there are no opposite opinions. > That's fine with me. Please also add it to bytes and bytearray objects. It's okay if the implementation has to scan the string -- so do isdigit() etc. -- --Guido van Rossum (python.org/~guido)
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