(self, key)
| 214 | ) |
| 215 | |
| 216 | def operand(self, key): |
| 217 | # Access an operand unambiguously |
| 218 | # (e.g. if the key is reserved by a method/property) |
| 219 | return self.operands[type(self)._parameters.index(key)] |
| 220 | |
| 221 | def dependencies(self): |
| 222 | # Dependencies are `Expr` operands only |