Use python Data processing , The code is as follows ：

```import numpy as np
fs = 5
ts = np.arange(-1,1+1/fs,1/fs)```

Found such a mistake ：

```Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ZeroDivisionError: division by zero```

Find cause , Found to be python The division rule doesn't make it clear , The correct way of writing should be

```import numpy as np
fs = 5.0
ts = np.arange(-1,1+1/fs,1/fs)```

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