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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| """A dict-like table mapping keys to values based on indexing""" | ||
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| import warnings | ||
|
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| class itable(object): | ||
|
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| def __init__(self, keys=None, values=None): | ||
| """A dict-like table mapping keys to values based on indexing""" | ||
| if keys is not None and values is not None: | ||
| self.update(keys, values) | ||
| elif keys is None and values is None: | ||
| self.__keys__ = [] | ||
| self.__values__ = [] | ||
| else: | ||
| raise TypeError('Must provide a sequence for both keys and values') | ||
|
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| def __getitem__(self, key): | ||
| try: | ||
| i = self.__keys__.index(key) | ||
| except ValueError: | ||
| raise KeyError(key) | ||
| else: | ||
| return self.__values__[i] | ||
|
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| def __setitem__(self, key, value): | ||
| try: | ||
| i = self.__keys__.index(key) | ||
| except ValueError: | ||
| try: | ||
| hash(key) | ||
| except: | ||
| pass | ||
| else: | ||
| warnings.warn('got a hashable mapping; use `dict` instead') | ||
| self.__keys__.append(key) | ||
| self.__values__.append(value) | ||
| else: | ||
| self.__values__[i] = value | ||
|
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| def __delitem__(self, key): | ||
| try: | ||
| i = self.__keys__.index(key) | ||
| except ValueError: | ||
| raise KeyError(key) | ||
| else: | ||
| del self.__keys__[i] | ||
| del self.__values__[i] | ||
|
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| def __iter__(self): | ||
| return self.__keys__.__iter__() | ||
|
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| def update(self, keys, values): | ||
| if len(keys) != len(values): | ||
| raise ValueError('keys and values must have the same length') | ||
| try: | ||
| map(hash, keys) | ||
| except: | ||
| pass | ||
| else: | ||
| warnings.warn('got a hashable mapping; use `dict` instead') | ||
|
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||
| try: | ||
| # repeated keys are not removed, | ||
| # however they will be ignored | ||
| self.__keys__ = list(keys)[::-1] | ||
| self.__values__ = list(values)[::-1] | ||
| except: | ||
| raise ValueError('keys and values must be iterable') | ||
|
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| def pop(self, key): | ||
| try: | ||
| i = self.__keys__.index(key) | ||
| except ValueError: | ||
| raise KeyError(key) | ||
| else: | ||
| del self.__keys__[i] | ||
| return self.__values__.pop(i) | ||
|
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| def keys(self): | ||
| return self.__keys__[:] | ||
|
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| def values(self): | ||
| return self.__values__[:] | ||
|
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| def items(self): | ||
| return zip(self.__keys__, self.__values__) | ||
|
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| def __repr__(self): | ||
| body = [] | ||
| for k, v in self.items(): | ||
| body.append(repr(k) + ': ' + repr(v)) | ||
| return '{' + ', '.join(body) + '}' |