temperature convert

Author: qiwsir

newcodes/answers/q69.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+class Temperature:
+    coefficients = {'c':(1.0, 0.0, -273.15), 'f':(1.8, -273.15, 32.0)}
+
+    def __init__(self, **kwargs):
+        try:
+            name, value = kwargs.popitem()
+        except KeyError:
+            name, value = 'k', 0
+
+        if kwargs or name not in "kcf":
+            kwargs[name] = value
+            raise TypeError( 'invalid arguments {0}'.format(kwargs))
+        setattr(self, name, float(value))
+
+    def __getattr__(self, name):
+        try:
+            eq = self.coefficients[name]
+        except KeyError:
+            raise AttributeError(name)
+        return (self.k + eq[1]) * eq[0] + eq[2]
+
+    def __setattr__(self, name, value):
+        if name in self.coefficients:
+            eq = self.coefficients[name]
+            self.k = (value - eq[2] ) / eq[0] - eq[1]
+        elif name == 'k':
+            object.__setattr__(self, name, value)
+        else:
+            raise AttributeError(name)
+
+    def __str__(self):
+        return "{0}K".format(self.k)
+
+if __name__ == "__main__":
+    t = Temperature(f = 70)
+    print(t.c)
+    t.c = 23
+    print(t.f)
+    print(t.k)