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中置演算子を擬似的に定義する Python プログラム
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| class Infix: | |
| def __init__(self, func): | |
| self.func = func | |
| def __ror__(self, other): | |
| return Infix(lambda x: self.func(other, x)) | |
| def __or__(self, other): | |
| return self.func(other) | |
| class Op: | |
| def __init__(self, symbol): | |
| self.symbol = symbol | |
| def __ror__(self, other): | |
| if self.symbol == "+": | |
| return Infix(lambda x: other + x) | |
| elif self.symbol == "-": | |
| return Infix(lambda x: other - x) | |
| elif self.symbol == "*": | |
| return Infix(lambda x: other * x) | |
| elif self.symbol == "/": | |
| return Infix(lambda x: other / x) | |
| else: | |
| raise ValueError("Invalid symbol") | |
| a = 5 | |
| b = 10 | |
| result = a |Op("*")| b | |
| print(result) # 50 |
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Memo:
文字列 |>, <| に関数の部分適用（partial）を割り当てたい
文字列 . に関数の合成を割り当てたい