如何利用scipy.signal获取滤波信号。黄油& lfilter吗?

I have a program whose purpose is to filter a noisy signal using butterworth filter. the code is listed below. The program cannot be complied because I did something wrong at the last step "y = butter_bandpass_filter(v_numbers, lowcut, highcut, fs, order=6)". What i want to get are three plots: 1.input signal in time domain, 2. butterworth filter in frquency domain. 3. output filtered signal in time domain.I have a program whose purpose is to filter a n