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| 1 | ||
| 2 | class Power(float): | |
| 3 | - | def __init__(self): |
| 3 | + | phys_unit = 'Watt' |
| 4 | - | self.phys_unit = 'Watt' |
| 4 | + | formal_letter = 'P' |
| 5 | - | self.formal_letter = 'P' |
| 5 | + | abbreviation = 'W' |
| 6 | - | self.abbreviation = 'W' |
| 6 | + | |
| 7 | def __mul__(self, other): | |
| 8 | pass | |
| 9 | ||
| 10 | def __div__(self, other): | |
| 11 | if isinstance(other, Voltage): | |
| 12 | return Current(self / other) | |
| 13 | ||
| 14 | elif isinstance(other, Current): | |
| 15 | return Voltage(self / other) | |
| 16 | ||
| 17 | ||
| 18 | class Resistance(float): | |
| 19 | phys_unit = 'Ohm' | |
| 20 | - | def __init__(self): |
| 20 | + | formal_letter = 'R' |
| 21 | - | self.phys_unit = 'Ohm' |
| 21 | + | # abbreviation = 'Ω' |
| 22 | - | self.formal_letter = 'R' |
| 22 | + | |
| 23 | - | self.abbreviation = 'Ω' |
| 23 | + | |
| 24 | if isinstance(other, Current): | |
| 25 | return Voltage(self * other) | |
| 26 | ||
| 27 | def __div__(self, other): | |
| 28 | pass | |
| 29 | ||
| 30 | ||
| 31 | class Current(float): | |
| 32 | phys_unit = 'Ampere' | |
| 33 | formal_letter = 'I' | |
| 34 | - | def __init__(self): |
| 34 | + | abbreviation = 'A' |
| 35 | - | self.phys_unit = 'Ampere' |
| 35 | + | |
| 36 | - | self.formal_letter = 'I' |
| 36 | + | |
| 37 | - | self.abbreviation = 'A' |
| 37 | + | |
| 38 | return Power(self * other) | |
| 39 | ||
| 40 | def __div__(self, other): | |
| 41 | pass | |
| 42 | ||
| 43 | class Voltage(float): | |
| 44 | phys_unit = 'Volt' | |
| 45 | formal_letter = 'U' | |
| 46 | abbreviation = 'V' | |
| 47 | - | def __init__(self): |
| 47 | + | |
| 48 | - | self.phys_unit = 'Volt' |
| 48 | + | |
| 49 | - | self.formal_letter = 'U' |
| 49 | + | |
| 50 | - | self.abbreviation = 'V' |
| 50 | + | |
| 51 | ||
| 52 | ||
| 53 | def __div__(self, other): | |
| 54 | if isinstance(other, Current): | |
| 55 | return Resistance(self / other) | |
| 56 | ||
| 57 | elif isinstance(other, Resistance): | |
| 58 | return Current(self / other) |
