import inspect
from scipy import signal

# 获取signal.filtfilt函数源码所在文件的位置
filename = inspect.getsourcefile(signal.filtfilt)
print(filename)
>>>D:\install\Anaconda\lib\site-packages\scipy\signal\signaltools.py

# 获取signal.filtfilt函数源码
print(inspect.getsource(signal.filtfilt))

# 获取函数说明
help(signal.filtfilt)