Applied Programming/Modules and Classes/Python3
classes.py
[edit | edit source]"""This program demonstrates use of the Temperature class."""
from temperature import Temperature
temperature = Temperature(celsius=37)
print(temperature.fahrenheit)
temperature = Temperature(fahrenheit=98.6)
print(temperature.celsius)
temperature = Temperature()
temperature.celsius = 37
print(temperature.fahrenheit)
temperature = Temperature()
temperature.fahrenheit = 98.6
print(temperature.celsius)
temperature = Temperature()
print(temperature.to_celsius(98.6))
print(temperature.to_fahrenheit(37))
temperature.py
[edit | edit source]"""Temperature container / converter.
Examples:
from temperature import Temperature
temperature = Temperature(celsius=37)
print(temperature.fahrenheit)
temperature = Temperature(fahrenheit=98.6)
print(temperature.celsius)
temperature = Temperature()
temperature.celsius = 37
print(temperature.fahrenheit)
temperature = Temperature()
temperature.fahrenheit = 98.6
print(temperature.celsius)
temperature = Temperature()
print(temperature.to_celsius(98.6))
print(temperature.to_fahrenheit(37))
"""
class Temperature(object):
"""Supports Fahrenheit and Celius temperatures."""
def __init__(self, fahrenheit=None, celsius=None):
"""Creates a temperature object.
Args:
fahrenheit (float): Optional Fahrenheit temperature.
celius (float): Optional Celius temperature.
Raises:
ValueError: If both fahrenheit and celsius are initialized.
"""
self._celsius = None
self._fahrenheit = None
if fahrenheit != None and celsius != None:
raise ValueError("Only initialize fahrenheit or celsius, not both.")
if fahrenheit != None:
self.fahrenheit = float(fahrenheit)
if celsius != None:
self.celsius = float(celsius)
@property
def celsius(self):
"""Gets Celsius temperature.
Returns:
float: Celsius temperature
"""
return self._celsius
@celsius.setter
def celsius(self, value):
"""Sets Celsius temperature.
Args:
value (float): Celsius temperature
"""
self._celsius = float(value)
self._fahrenheit = self.to_fahrenheit(self.celsius)
@property
def fahrenheit(self):
"""Gets Fahrenheit temperature.
Returns:
float: Fahrenheit temperature
"""
return self._fahrenheit
@fahrenheit.setter
def fahrenheit(self, value):
"""Sets Fahrenheit temperature.
Args:
value (float): Fahrenheit temperature
"""
self._fahrenheit = float(value)
self._celsius = self.to_celsius(self.fahrenheit)
def to_celsius(self, fahrenheit):
"""Converts Fahrenheit temperature to Celsius.
Args:
fahrenheit (float): Fahrenheit temperature to be converted
Returns:
float: Celsius temperature
"""
return (fahrenheit - 32) * 5 / 9
def to_fahrenheit(self, celsius):
"""Converts Celsius temperature to Fahrenheit.
Args:
celsius (float): Celsius temperature to be converted
Returns:
float: Fahrenheit temperature
"""
return celsius * 9 / 5 + 32
def test(self):
"""Tests all class properties and methods.
Returns:
True: If all tests successful.
Raises:
AssertionError: If a test fails.
"""
temperature = Temperature()
assert temperature.celsius == None
assert temperature.fahrenheit == None
temperature.fahrenheit = 98.6
assert temperature.celsius == 37
temperature.celsius = 37
assert temperature.fahrenheit == 98.6
temperature = Temperature(fahrenheit=98.6)
assert temperature.celsius == 37
temperature = Temperature(celsius=37)
assert temperature.fahrenheit == 98.6
assert temperature.to_celsius(98.6) == 37
assert temperature.to_fahrenheit(37) == 98.6
return True
if __name__ == "__main__":
"""Run tests if module is executed by name."""
temperature = Temperature()
if temperature.test():
print("All tests successful!")
Try It
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