108 lines
2.8 KiB
Python
108 lines
2.8 KiB
Python
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import sys
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import collections
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import random
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import string
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from io import StringIO
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from itertools import tee
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def import_class(cls):
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module = '.'.join(cls.split('.')[:-1])
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cls = cls.split('.')[-1]
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module = __import__(module, fromlist=[module])
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return getattr(module, cls)
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def random_ascii(length):
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return ''.join([random.SystemRandom().choice(string.hexdigits) for i in range(0, length)]).lower()
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def format_exception(exception):
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name = type(exception).__name__
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return ': '.join((name, str(exception)))
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class OrderedSet(collections.MutableSet):
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def __init__(self, iterable=None):
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self.end = end = []
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end += [None, end, end] # sentinel node for doubly linked list
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self.map = {} # key --> [key, prev, next]
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if iterable is not None:
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self |= iterable
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def __len__(self):
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return len(self.map)
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def __contains__(self, key):
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return key in self.map
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def add(self, key):
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if key not in self.map:
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end = self.end
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curr = end[1]
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curr[2] = end[1] = self.map[key] = [key, curr, end]
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def discard(self, key):
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if key in self.map:
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key, prev, next = self.map.pop(key)
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prev[2] = next
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next[1] = prev
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def __iter__(self):
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end = self.end
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curr = end[2]
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while curr is not end:
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yield curr[0]
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curr = curr[2]
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def __reversed__(self):
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end = self.end
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curr = end[1]
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while curr is not end:
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yield curr[0]
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curr = curr[1]
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def pop(self, last=True):
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if not self:
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raise KeyError('set is empty')
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key = self.end[1][0] if last else self.end[2][0]
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self.discard(key)
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return key
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def __repr__(self):
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if not self:
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return '%s()' % (self.__class__.__name__,)
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return '%s(%r)' % (self.__class__.__name__, list(self))
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def __eq__(self, other):
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if isinstance(other, OrderedSet):
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return len(self) == len(other) and list(self) == list(other)
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return set(self) == set(other)
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class AttrDict(dict):
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def __init__(self, *args, **kwargs):
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super(AttrDict, self).__init__(*args, **kwargs)
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self.__dict__ = self
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def __hash__(self):
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return hash(id(self))
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class CaptureStdout(list):
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def __enter__(self):
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self._stdout = sys.stdout
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sys.stdout = self._stringio = StringIO()
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return self
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def __exit__(self, *args):
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self.extend(self._stringio.getvalue().splitlines())
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sys.stdout = self._stdout
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def pairwise(iterable):
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"s -> (s0,s1), (s1,s2), (s2, s3), ..."
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a, b = tee(iterable)
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next(b, None)
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return zip(a, b)
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