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Using ILU With Python


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Tutorial.isl



A D V E R T I S E M E N T

INTERFACE Tutorial;

EXCEPTION DivideByZero
  "this error is signalled if the client of the Calculator calls
the Divide method with a value of 0";

TYPE Calculator = OBJECT COLLECTIBLE
  DOCUMENTATION "4-function calculator"
  METHODS
    SetValue (v : REAL) "Set the value of the calculator to `v'",
    GetValue () : REAL  "Return the value of the calculator",
    Add (v : REAL)      "Adds `v' to the calculator's value",
    Subtract (v : REAL) "Subtracts `v' from the calculator's value",
    Multiply (v : REAL) "Multiplies the calculator's value by `v'",
    Divide (v : REAL) RAISES DivideByZero END
      "Divides the calculator's value by `v'"
  END;

TYPE Factory = OBJECT
  METHODS
    CreateCalculator () : Calculator
  END;

 



CalculatorImpl.py


import Tutorial, Tutorial__skel

class Calculator (Tutorial__skel.Calculator):

        def __init__ (self):
                self.the_value = 0.0

        def SetValue (self, v):
                self.the_value = v

        def GetValue (self):
                return self.the_value

        def Add (self, v):
                self.the_value = self.the_value + v

        def Subtract (self, v):
                self.the_value = self.the_value - v

        def Multiply (self, v):
                self.the_value = self.the_value * v

        def Divide (self, v):
                try:
                        self.the_value = self.the_value / v
                except ZeroDivisionError:
                        raise Tutorial.DivideByZero

 



FactoryImpl.py


import Tutorial, Tutorial__skel, CalculatorImpl

class Factory (Tutorial__skel.Factory):

        # have the __init__ method take handle and server args
        # so that we can control which ILU kernel server is used,
        # and what the instance handle of the Factory object on
        # that server is.  This allows us to control the object ID
        # of the new Factory instance.

        def __init__(self, handle=None, server=None):
                self.IluInstHandle = handle
                self.IluServer = server
                
        def CreateCalculator (self):
                return (CalculatorImpl.Calculator())

 



simple1.py


# simple1.py, a simple program that demonstrates the use of the
#  Tutorial true module as a library.
#
# run this with the command "python simple1.py NUMBER [NUMBER...]"
#

import Tutorial, CalculatorImpl, string, sys

# A simple program:
#  1)  make an instance of Tutorial.Calculator
#  2)  add all the arguments by invoking the Add method
#  3)  print the resultant value.

def main (argv):

        c = CalculatorImpl.Calculator()
        if not c:
                error("Couldn't create calculator")

        # clear the calculator before using it

        c.SetValue (0.0)

        # now loop over the arguments, adding each in turn */

        for arg in argv[1:]:
                v = string.atof(arg)
                c.Add (v)

        # and print the result

        print "the sum is", c.GetValue()
        sys.exit(0)

main(sys.argv)

 



simple2.py


# simple2.py, a simple program that demonstrates the use of the
#  Tutorial true module as a library.
#
# run this with the command "python simple1.py NUMBER [NUMBER...]"
#

import Tutorial, CalculatorImpl, string, sys

# A simple program:
#  1)  make an instance of Tutorial.Calculator
#  2)  add all the arguments by invoking the Add method
#  3)  print the resultant value.

def main (argv):

        c = CalculatorImpl.Calculator()
        if not c:
                error("Couldn't create calculator")

        # clear the calculator before using it

        if (len(sys.argv) < 2):
                c.SetValue (0.0)
        else:
                c.SetValue (string.atof(argv[1]))

        # now loop over the arguments, Dividing by each in turn */

        try:
                for arg in argv[2:]:
                        v = string.atof(arg)
                        c.Divide (v)
        except:
                print 'exception signalled:  ' + str(sys.exc_type)
                sys.exit(1)

        # and print the result

        print "the sum is", c.GetValue()
        sys.exit(0)

main(sys.argv)

 



server.py


# server.py -- a program that runs a Tutorial.Calculator server
#

import ilu, FactoryImpl, sys

def main(argv):

        if (len(argv) < 2):
                print "Usage:  python server.py SERVER-ID"
                sys.exit(1)

        # Create a kernel server with appropriate server ID, which
        #  is passed in as the first argument

        theServer = ilu.CreateServer (argv[1])

        # Now create an instance of a Factory object on that server,
        #  with the instance handle "theFactory"

        theFactory = FactoryImpl.Factory ("theFactory", theServer)

        # Now make the Factory object "well-known" by publishing it.

        theFactory.IluPublish()

        # Now we print the string binding handle (the object's name plus
        # its location) of the new instance.

        print "Factory instance published."
        print "Its SBH is '" + theFactory.IluSBH() + "'"

        handle = ilu.CreateLoopHandle()
        ilu.RunMainLoop (handle)


main(sys.argv)

 



simple3.py


# simple3.py -- a simple client program that finds the Calculator Factory,
#   creates a calculator, and adds up its arguments as before
#
# to run:  python simple4.py ARG [ARG...]

import Tutorial, ilu, sys, string

# We define a new routine, "Get_Tutorial_Calculator", which 
# finds the tutorial factory, then creates a new Calculator
# object for us.

def Get_Tutorial_Calculator (factoryObjectID):

        # We have to call ilu.LookupObject() with the object ID of
        # the factory object, and the "type" of the object we're looking
        # for, which is always available as MODULE.TYPENAME

        f = ilu.LookupObject (factoryObjectID, Tutorial.Factory)
        if not f:
                print "Can't find Tutorial.Factory instance " + factoryObjectID
                sys.exit(1)
        c = f.CreateCalculator()
        return (c)

def main (argv):

        # A simple program:
        #  1)  make an instance of Tutorial.Calculator
        #  2)  add all the arguments by invoking the Add method
        #  3)  print the resultant value.

        if (len(argv) < 2):
                print "Usage:  python simple3.py FACTORY-OBJECT-ID NUMBER [NUMBER...]\n",
                sys.exit(1)

        c = Get_Tutorial_Calculator(argv[1])
        if not c:
                print "Couldn't create calculator"
                sys.exit(1)

        # clear the calculator before using it

        c.SetValue (0.0)

        # now loop over the arguments, adding each in turn

        for arg in argv[2:]:
                v = string.atof (arg)
                c.Add (v)

        # and print the result

        print "the sum is " + str(c.GetValue())

        sys.exit (0);  


main(sys.argv)

 



Tutorial2.isl


INTERFACE Tutorial2 IMPORTS Tutorial END;

TYPE OpType = ENUMERATION
    SetValue, Add, Subtract, Multiply, Divide END;

TYPE Operation = RECORD
    op : OpType,
    value : REAL,
    accumulator : REAL
  END;

TYPE RegisterTape = SEQUENCE OF Operation;

TYPE TapeCalculator = OBJECT COLLECTIBLE
  SUPERTYPES Tutorial.Calculator END
  DOCUMENTATION "4 function calculator with register tape"
  METHODS
    GetTape () : RegisterTape
  END;

TYPE Factory = OBJECT SUPERTYPES Tutorial.Factory END
  METHODS
    CreateTapeCalculator () : TapeCalculator
  END;



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Keywords: Using ILU with Python, ILU, ILU, ILU tutorial, ILU tutorial pdf, history of ILU, Custamizing Style Sheet, learn ILU

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