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#coding:utf-8

'''

filename: temperature.py

'''

class Temperature:

coefficient = {"c": (1.0, 0.0, -273.15), "f": (1.8, -273.15, 32.0)}

def __init__(self, **kargs):

assert set(kargs.keys()).intersection("kfcKFC"), "invalid arguments {0}".format(kargs)

name, value = kargs.popitem()

name = name.lower()

setattr(self, name, float(value))

def __getattr__(self, name):

try:

eq = self.coefficient[name.lower()]

except KeyError:

raise AttributeError(name)

return (self.k + eq[1]) * eq[0] + eq[2]

def __setattr__(self, name, value):

name = name.lower()

if name in self.coefficient:

eq = self.coefficient[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)

def __repr__(self):

return "Temperature(K={0}".format(self.k)

t = Temperature(c=64)

print("c=64, f=", t.f)

t.f = 23

print("f=23, c=", t.c)