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54 lines
1.2 KiB
54 lines
1.2 KiB
''' |
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Created on Jun 03, 2022 |
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@author: error042 |
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''' |
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class Model: |
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''' |
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classdocs |
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''' |
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def __init__(self): |
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''' |
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Constructor |
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''' |
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self.previous_value = '' |
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self.value = '' |
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self.operator = '' |
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def calculate(self, caption): |
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if caption == 'C': |
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self.value = '' |
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elif caption == '+/-': |
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self.value = self.value[1:] if self.value[0] == '-' else '-' + self.value |
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elif caption == '.': |
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if not caption in self.value: |
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self.value += caption |
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elif self.value[-1] == caption: |
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self.value = self.value[:-1] |
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elif caption == '%': |
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self.operator = '/' |
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self.previous_value = self.value |
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self.value = '100' |
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self.value = str(self._evaluate()) |
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elif caption == '=': |
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self.value = str(self._evaluate()) |
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elif isinstance(caption, int): |
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self.value += str(caption) |
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else: |
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if self.value: |
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self.operator = caption |
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self.previous_value = self.value |
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self.value = '' |
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return self.value |
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def _evaluate(self): |
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return eval(self.previous_value+self.operator+self.value) |