Python object creation

Question

I am pretty new to Python world and trying to learn it.

This is what I am trying to achieve: I want to create a Car class, its constructor checks for the input to set the object carName as the input. I try to do this by using the java logic but I seem to fail :)

class Car():
    carName = "" #how can I define a non assigned variable anyway like "String carName;" in java
    def __self__(self,input):
        self.carName = input

    def showName():
        print carName

a = Car("bmw")
a.showName()

What book are you using to teach yourself Python? Where did you see code like this? Did you read a web site? If so, which one? — S.Lott
– S.Lott, Commented Jul 22, 2009 at 10:29

sunqiang · Accepted Answer · 2009-07-22 15:53:11Z

14

derived from object for new-style class
use __init__ to initialize the new instance, not __self__
__main__ is helpful too.

class Car(object):
    def __init__(self,input):
        self.carName = input

    def showName(self):
        print self.carName
def main():
    a = Car("bmw")
    a.showName()
if __name__ == "__main__":
    main()

edited Jul 22, 2009 at 15:53

answered Jul 22, 2009 at 10:21

sunqiang

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Comments

MrHus · Accepted Answer · 2009-07-22 18:34:38Z

2

You don't define a variable, and you use init and self. Like this:

class Car(Object):
    def __init__(self,input):
        self.carName = input

    def showName(self):
        print self.carName

a = Car("bmw")
a.showName()

edited Jul 22, 2009 at 18:34

answered Jul 22, 2009 at 10:22

MrHus

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Comments

vlad · Accepted Answer · 2009-07-22 10:40:00Z

1

this is not correct!

class Car():
    carName = "" #how can I define a non assigned variable anyway like "String carName;" in java
    def __self__(self,input):
        self.carName = input

the first carName is a class Variable like static member in c++

the second carName (self.carName) is an instance variable, if you want to set the class variable with the constructor you have to do it like this:

class Car():
    carName = "" #how can I define a non assigned variable anyway like "String carName;" in java
    def __self__(self,input):
        Car.carName = input

answered Jul 22, 2009 at 10:40

vlad

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