[100] | 1 | '''
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| 2 | A few simple but often needed tools.
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| 3 | '''
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| 4 | from _collections_abc import dict_items #type:ignore
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| 5 | from typing import TypeVar, Optional
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| 6 |
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| 7 |
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| 8 | def toStr(d)->str:
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| 9 | '''
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| 10 | prettyprint a "primitive" like dict or list,
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| 11 | similar to how java prints it.
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| 12 | In java, strings are NOT quoted.
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| 13 | '''
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| 14 | if isinstance(d, dict):
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| 15 | return "{"+ (", ".join([toStr(k)+"="+toStr(v) for (k,v) in d.items()]))+"}"
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| 16 | if isinstance(d, list):
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| 17 | return "["+(", ".join([toStr(v) for v in d])) + "]"
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| 18 | if isinstance(d, tuple):
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| 19 | return "("+(", ".join([toStr(v) for v in d]))+")"
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| 20 | if isinstance(d, set):
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| 21 | return "{"+(", ".join([toStr(v) for v in d]))+"}"
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| 22 | return str(d)
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| 23 |
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| 24 | def toTuple(d:dict) -> tuple:
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| 25 | '''
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| 26 | Converts dict into tuples of tuples. Used mainly to compute hash
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| 27 | '''
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| 28 | return tuple([(k,v) for (k,v) in d.items()])
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| 29 |
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| 30 | T = TypeVar('T')
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| 31 | def val(v:Optional[T])->T:
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| 32 | '''
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| 33 | @return the value contained in the optional.
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| 34 | Raises exception if the value is None.
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| 35 | '''
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| 36 | if not v:
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| 37 | raise ValueError("Value is not set")
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| 38 | return v
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| 39 |
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| 40 | def HASH(obj) -> int:
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| 41 | '''
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| 42 | hashes built-in objects, even dict and list of built-in objects.
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| 43 | '''
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| 44 | if isinstance(obj, list) or isinstance(obj, set) or\
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| 45 | isinstance(obj, tuple) or isinstance(obj, dict_items):
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| 46 | return 31+sum([HASH(e) for e in obj])
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| 47 | if isinstance(obj, dict):
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| 48 | return HASH(obj.items())
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| 49 | return hash(obj) |
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