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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _compile_int_f(self):
 """Time Domain Simulation - update differential equations"""

        string = '"""\n'
        string += 'system.dae.init_f()\n'

        # evaluate differential equations f
        for fcall, call in zip(self.fcall, self.fcalls):
            if fcall:
                string += call
        string += 'system.dae.reset_small_f()\n'
        string += '"""'
        self.int_f = compile(eval(string), '', 'exec')