Hi everybody,
So I'm new to python and have questions about the following code:
class Robot:
'''Represents a Robot with a name.
Deletes and makes Robots for testing perpuses'''
#a var for counting the number of Robots
population = 0
def __init__(self, name):
'''initializes the data'''
self.name=name
print ('initializing {0}'.format(self.name))
Robot.population+=1
def __del__(self):
'''I'm dying'''
print ('{0} is being destroyed!'.format(self.name))
Robot.population-=1
if Robot.population==0:
print ("{0} was the last one".format(self.name))
else:
print ("there are still {0:d} Robots
working".format(Robot.population))
def Sayhi (self):
'''This is just a hi thing.
Just to say hi<<< to practice convention of docstrings'''
print ('hello, khalid calls me {0}'.format(self.name))
def howMany():
'''prints how many'''
print ('we have {0:d} Robots'.format (Robot.population))
howMany= staticmethod(howMany)
droid1 = Robot('D23')
droid1.Sayhi()
Robot.howMany()
droid2 = Robot('F0009')
droid2.Sayhi()
Robot.howMany()
print ("\nRobots can do some work here\n")
print ("Robots have finished their work. So let's destroy them")
del droid1
del droid2
Robot.howMany()
1- In the class definition above, I don't get the "self.name=name". I
understand that the self is supposed to refer to the actual object, but
since it is an initialization method, there is no way to enter a name in
place of the arguments.
2- in the final few lines where I assign an object to the class, I notice
that a parameter was entered in the class name, "Robot(D23)", although when
defining the class I didn't put any arguments for it.
3- what is the difference between all the underscore, underscore attributes
like:__class__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__',
'__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__',
'__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
'__setattr__
and the rest of the normal methods for a class.?
I know, lots of questions, but what can i say... I am new!!
so can you guy/gals help?
thanks a million.
khalid
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