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src/future/builtins/new_min_max.py
59 строк
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Chase Sterling
Make new min/max error message consistent builtin error message
18 окт 2019, 17:32
18 окт 2019, 17:32
f4926e5
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import itertools from future import utils if utils.PY2: from __builtin__ import max as _builtin_max, min as _builtin_min else: from builtins import max as _builtin_max, min as _builtin_min _SENTINEL = object() def newmin(*args, **kwargs): return new_min_max(_builtin_min, *args, **kwargs) def newmax(*args, **kwargs): return new_min_max(_builtin_max, *args, **kwargs) def new_min_max(_builtin_func, *args, **kwargs): """ To support the argument "default" introduced in python 3.4 for min and max :param _builtin_func: builtin min or builtin max :param args: :param kwargs: :return: returns the min or max based on the arguments passed """ for key, _ in kwargs.items(): if key not in set(['key', 'default']): raise TypeError('Illegal argument %s', key) if len(args) == 0: raise TypeError if len(args) != 1 and kwargs.get('default', _SENTINEL) is not _SENTINEL: raise TypeError if len(args) == 1: iterator = iter(args[0]) try: first = next(iterator) except StopIteration: if kwargs.get('default', _SENTINEL) is not _SENTINEL: return kwargs.get('default') else: raise ValueError('{}() arg is an empty sequence'.format(_builtin_func.__name__)) else: iterator = itertools.chain([first], iterator) if kwargs.get('key') is not None: return _builtin_func(iterator, key=kwargs.get('key')) else: return _builtin_func(iterator) if len(args) > 1: if kwargs.get('key') is not None: return _builtin_func(args, key=kwargs.get('key')) else: return _builtin_func(args)