Python Examples
Dave Braunschweig
Objects
# This class converts temperature between Celsius and Fahrenheit.
# It may be used by assigning a value to either Celsius or Fahrenheit
# and then retrieving the other value, or by calling the to_celsius or
# to_fahrenheit methods directly.
#
# References:
# https://www.mathsisfun.com/temperature-conversion.html
# https://en.wikibooks.org/wiki/Python_Programming
class Temperature:
_celsius = None
_fahrenheit = None
@property
def celsius(self):
return self._celsius
@celsius.setter
def celsius(self, value):
self._celsius = float(value)
self._fahrenheit = self.to_fahrenheit(self._celsius)
@property
def fahrenheit(self):
return self._fahrenheit
@fahrenheit.setter
def fahrenheit(self, value):
self._fahrenheit = float(value)
self._celsius = self.to_celsius(self._fahrenheit)
def __init__(self, celsius=None, fahrenheit=None):
if celsius != None:
self._celsius = celsius
self._fahrenheit = self.to_fahrenheit(celsius)
if fahrenheit != None:
self._fahrenheit = fahrenheit
self._celsius = self.to_celsius(fahrenheit)
def to_celsius(self, fahrenheit):
return (fahrenheit - 32) * 5 / 9
def to_fahrenheit(self, celsius):
return celsius * 9 / 5 + 32
# This program creates instances of the Temperature class to convert Cesius
# and Fahrenheit temperatures.
def main():
temp1 = Temperature(celsius=0)
print("temp1.celsius =", temp1.celsius)
print("temp1.fahrenheit =", temp1.fahrenheit)
print("")
temp1.celsius = 100
print("temp1.celsius =", temp1.celsius)
print("temp1.fahrenheit =", temp1.fahrenheit)
print("")
temp2 = Temperature(fahrenheit=0)
print("temp2.fahrenheit =", temp2.fahrenheit)
print("temp2.celsius =", temp2.celsius)
print("")
temp2.fahrenheit = 100
print("temp2.fahrenheit =", temp2.fahrenheit)
print("temp2.celsius =", temp2.celsius)
main()
Output
temp1.celsius = 0 temp1.fahrenheit = 32.0 temp1.celsius = 100.0 temp1.fahrenheit = 212.0 temp2.fahrenheit = 0 temp2.celsius = -17.77777777777778 temp2.fahrenheit = 100.0 temp2.celsius = 37.77777777777778
