An architect must fit multiple heaters in a large building. In order to make a computer simulation of the heat control of the building, he must be able to represent a series of heaters. Every heater is described by the following information fields: a name of the heater, the current setting of the temperature, the minimum temperature allowed and the maximum temperature allowed. In the simulation, the temperature of a certain heater must be increased or decreased, and one must be able at all times to ask the current temperature of every heater.

Assignment

Make a class Heater that supports the following methods:

• An initialisation method __init__ that takes the name of the heater (str). In addition, the method also has three optional parameters that take the following information: i) the current setting of the temperature (int or float; default value: 10.0), ii) the minimum temperature allowed (int or float; default value: 0.0) and iii) the maximum temperature allowed (int or float; default value: 100.0).

• A method __str__ that returns a string representation of the heater (str). The exact formatting of the string representation can be derived from the example below. All numbers must be represented with one decimal digit (using rounding).

• A method __repr__ that returns a string representation of the heater (str). Where the method __str__ is used to obtain a human readable string representation of the object, the method __repr__ must return a string representation that makes sense to the Python interpreter: a syntactically correct Python expression, that — when evaluated — makes an object that is equal to the object that is passed to the method __repr__. All numbers must be represented with one decimal digit (using rounding).

• A method change_temperature that can be used to modify the current setting of the temperature. The method takes the increase in temperature (int or float; which actually is a decrease in temperature if a negative number is passed). The method must make sure that the current setting of the temperature always remains within the interval of allowed temperatures. If the new setting of the temperature would be lower than the minimum temperature allowed (resp. higher than the maximum temperature allowed), the new setting of the temperature is equated to the minimum (resp. maximum) temperature allowed.

• A method temperature that returns the current setting of the temperature (float).

Example

>>> machine1 = Heater('radiator kitchen', temperature=20)
>>> machine2 = Heater('radiator living', minimum=15, temperature=18)    
>>> machine3 = Heater('radiator bathroom', temperature=22, minimum=18, maximum=28)
>>> print(machine1)
radiator kitchen: current temperature: 20.0; allowed min: 0.0; allowed max: 100.0
>>> machine2
Heater('radiator living', 18.0, 15.0, 100.0)
>>> machine2.change_temperature(8)
>>> machine2.temperature()
26.0
>>> machine3.change_temperature(-5)
>>> machine3
Heater('radiator bathroom', 18.0, 18.0, 28.0)