Why does this simple numpy multiply operation raise an "invalid number of arguments" error?

Question

This works

numpy.multiply(13, 3)

This doesn't

numpy.multiply(x1=13, x2=3)

It raises an invalid number of arguments exception. Can someone explain why please. I tried to follow the documentation but got a bit lost with the /, and * characters which are included in the argument list. If you could explain the meaning of these too it would be appreciated.

Arguments before the slash are positional only, so you cannot pass them as keyword arguments; read the help(range) question for more details. — YSelf, Feb 27 '18 at 13:23

score 7 · Accepted Answer · edited Feb 27 '18 at 13:50

7

https://docs.scipy.org/doc/numpy/reference/generated/numpy.multiply.html

The / and * delimit positional-only and keyword-only arguments, respectively. Any arguments listed before the / can only be given as positional arguments, with no keyword (i.e. no x1, x2). Arguments listed after the * can only be given with a keyword.

Keyword-Only Arguments

Positional-Only Arguments

edited Feb 27 '18 at 13:50

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answered Feb 27 '18 at 13:25

Mark Whitfield

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Thank you very much for the help – Jinglesting Feb 27 '18 at 13:35

Why does this simple numpy multiply operation raise an "invalid number of arguments" error?

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