Programme chap4_classe_2431_.py

# coding: latin-1
s = """class carre :
    def __init__( self, a) : self.a = a
    def __str__ (self)     : return "carre " + str (self.a)

class rectangle (carre):
    def __init__(self,a,b) :
        carre.__init__(self, a)
        self.b = b
    def __str__ (self) :
        return "rectangle " + str (self.a) +  " x " +  str (self.b)"""

obj = compile(s,"","exec")       # code à compiler
exec (obj)                       # classes incorporées au programme

r = rectangle (3,4)
print r  # affiche rectangle 3 x 4
c = carre (5)
print c  # affiche carre 5