The material from the exercise session:

You can contact me via my email address: siavashs at csc dot kth.se, you can see my callendar in 
<a href='http://www.nada.kth.se/~siavashs/'>my homepage</a>. 

<ul>
<li>&ouml;vning 4<br> 
  <p>We discussed the phonebook program. You can get my code from <a href='phonebook.py'>here</a>.
    You can download a very short sample file of your phonebook <a href='myphonebook.txt'>here</a>.
    You can download a very short sample file of your friend's phonebook <a href='friendphonebook.txt'>here</a>.<br>
    Your questions and comments are very welcome, always. </p>

<li>&ouml;vning 5<br> 
  <p>We discussed the class definition and usage in python. I upload some programs here which are taken from 
    some other courses I teach. I hope they are useful. Comments and feedbacks are very welcome and can be 
    sent to may email: siavashs at csc dot kth.se  
  </p>
  <p> Temperature can be set at different scales. Define the class temp with the methods Setka, setC, setF and getK, getca, getF.
    Then use the class in a program that reads the outside temperature (Celsius) and prints out the temperature so that an American understands (Fahrenheit).
<pre>
The file temp.py:
# -*- Coding: Latin-1 -*-
"" "Abstract data type for temperature" ""

nollC = 273.15                        
nollF = 255.3666666 # F-zero in the Kelvin

class Temp:

    def __init__ (self):
        self.K = 0 # Temperature in Kelvin

    def Setka (self, C): 
    self.K = K

    def setC (self, C):
    self.K = nollC + C

    def setF (self, F): 
    self.K = nollF +5 * F / 9

    def getK (self):   
    Return self.K

    def getca(self):   
    Return self.K-nollC

    def getF (self):   
    Return (self.K-nollF) * 9 / 5

# usage
D31_temp = Temp()
D31_temp.setC(23)
print(D31_temp.getca())

D41_temp = Temp()
D41_temp.setC(21)
print(D41_temp.getca())


</pre>
</p>


<p>
You can find some nice examples <a href='http://www.csc.kth.se/utbildning/kth/kurser/DD1343/datae09/Ovningsmaterial/grupp1/ovn5.html'>here</a></p>

<p>I got a question today during the class but I forgot to answer it. The question was about "object" which comes in parentheses in front of the class definition.
  Object is the base class in python (just like Java). The name that comes in parentheses in front of the class definition (in this particular case "object") is 
  the name of the class which the definition inherits from. If you dont understand this now, dont worry inheritance is not part of this course, just skip 
  this remark.</p>