这是我的代码:
> from scipy.fftpack import fft
> import matplotlib.pyplot as plt
> from numpy.lib import stride_tricks
> import matplotlib.pyplot as plt
> plotstft(sound_files["jazz"]["wavedata"],sound_files["jazz"]["samplerate"])
它会出错:" NameError:name' plotstft'未定义"。我该如何解决?我在ubuntu上使用python2.7