在这种情况下，“反斜杠”在做什么？

Question

The following code was constructed to be an efficent method of finding the the closest pairs for two elements in a list:

idx = np.searchsorted(xx, yy, side="left").clip(max=xx.size-1)
mask = (idx > 0) &  \
       ( (idx == len(xx)) | (np.fabs(yy - xx[idx-1]) < np.fabs(yy - xx[idx])) )
out = xx[idx-mask]

I have a simple question: What is the backslash doing in this code? I've tried googling and trying different codes to figure it out myself without success, for example:

Here I see that it doesn't seem like the backslash is an operator that acts on numpy arrays.

Answer 1

\ is the line continuation character . Non-whitespace characters after this, will trigger a SyntaxError , as you have discovered the hard way.