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Code Block
def f(x,y) : return x if y>0 else -x list = map(f, arrX, arrY)

Constructor, destructor etc.

Code Block

class PeakListFile :
    def __init__(self, fname) :
	    print 'constructor'
        self.f=open(fname,'r')

    def __del__(self) :
	    print 'destructor'
        try :
            self.f.close()

    def __call__(self) :
	    print 'this is a default method of this object called as obj()'

Polymorphism

Derived class initialization

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