JezK
Edit File: _text.py
import re from ._functools import method_cache # from jaraco.text 3.5 class FoldedCase(str): """ A case insensitive string class; behaves just like str except compares equal when the only variation is case. >>> s = FoldedCase('hello world') >>> s == 'Hello World' True >>> 'Hello World' == s True >>> s != 'Hello World' False >>> s.index('O') 4 >>> s.split('O') ['hell', ' w', 'rld'] >>> sorted(map(FoldedCase, ['GAMMA', 'alpha', 'Beta'])) ['alpha', 'Beta', 'GAMMA'] Sequence membership is straightforward. >>> "Hello World" in [s] True >>> s in ["Hello World"] True You may test for set inclusion, but candidate and elements must both be folded. >>> FoldedCase("Hello World") in {s} True >>> s in {FoldedCase("Hello World")} True String inclusion works as long as the FoldedCase object is on the right. >>> "hello" in FoldedCase("Hello World") True But not if the FoldedCase object is on the left: >>> FoldedCase('hello') in 'Hello World' False In that case, use in_: >>> FoldedCase('hello').in_('Hello World') True >>> FoldedCase('hello') > FoldedCase('Hello') False """ def __lt__(self, other): return self.lower() < other.lower() def __gt__(self, other): return self.lower() > other.lower() def __eq__(self, other): return self.lower() == other.lower() def __ne__(self, other): return self.lower() != other.lower() def __hash__(self): return hash(self.lower()) def __contains__(self, other): return super().lower().__contains__(other.lower()) def in_(self, other): "Does self appear in other?" return self in FoldedCase(other) # cache lower since it's likely to be called frequently. @method_cache def lower(self): return super().lower() def index(self, sub): return self.lower().index(sub.lower()) def split(self, splitter=' ', maxsplit=0): pattern = re.compile(re.escape(splitter), re.I) return pattern.split(self, maxsplit)