def METHOD_NAME(self):
    self.fs = fs = 1
    self.fc = fc = 0.3
    self.bw = bw = 0.1
    self.taps = filter.firdes.complex_band_pass(
        1, fs, -bw / 2, bw / 2, bw / 4)
    times = list(range(1024))
    self.src_data = [
        cmath.exp(-2j * cmath.pi * fc / fs * (t / 100.0)) for t in times]