Thank you Marcus for the reply.
let me show you an example of what I did. but so far i am not getting any
output from it
def set_parameters(self,amplitude):
global d_amplitude
d_amplitude= amplitude
print d_amplitude
#then on the contructor
def_init_(self, amplitude)
self.set_parameter(amplitude)
analog_sig_source = analog.sig_source_f(sampling_rate,
analog.GR_TRI_WAVE, f, d_amplitude, 0)
#then connect the block to other blocks
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