Why can't I import a function in Python using the "as" syntax?

Question

Why does this work,

from sklearn.metrics import mean_squared_error

but not the other?

import sklearn.metrics.mean_squared_error as mse

This gives

ModuleNotFoundError: No module named 'sklearn.metrics.mean_squared_error'

It is not possible because mean_squared_error is a function is my guess?

@RocketHazmat i know that works. I didn't to get something that works but why what I wrote it wrong. — Charlie Parker
– Charlie Parker, Commented Dec 1, 2020 at 20:48

Karl Knechtel · Accepted Answer · 2020-12-01 20:17:45Z

4

You cannot import sklearn.metrics.mean_squared_error because it is not a module but a function, yes. The as part stands completely independently. So you can, for example, from sklearn.metrics import mean_squared_error as mse.

answered Dec 1, 2020 at 20:17

Karl Knechtel

61.4k14 gold badges131 silver badges193 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Charlie Parker Over a year ago

I know that as implied in my question title. But what I want is why.

Karl Knechtel Over a year ago

I don't understand how I'm supposed to answer that. If "it is not a module" isn't an adequate explanation for "why do I get an error message saying no module named...", then I don't know what would be. Questions about why language designers made the design decisions they did are not a good fit for Stack Overflow; unless there is an authoritative interview with the designers, we are speculating and offering opinions.

Collectives™ on Stack Overflow

Why can't I import a function in Python using the "as" syntax?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related