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import re
class LazyRegexCompiler:
"""Descriptor to allow lazy compilation of regex"""
def __init__(self, pattern, flags=0):
self._pattern = pattern
self._flags = flags
self._compiled_regex = None
@property
def compiled_regex(self):
if self._compiled_regex is None:
self._compiled_regex = re.compile(self._pattern, self._flags)
return self._compiled_regex
def __get__(self, instance, owner):
return self.compiled_regex
def __set__(self, instance, value):
raise AttributeError("Can not set attribute LazyRegexCompiler")
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