Underscore issue

[Aaron Tresham]

For the last two weeks, many of my students have run into problems when using the underscore in SMC.

As I understand it, Python automatically writes the last output to _, so we might compute a derivative and then do show(_) to make it look nicer. Or perhaps we do a calculation and then do N(_) to convert to a decimal.

Anyway, for about two weeks both of these have failed. show(_) produces a strange list of SMC related words, while N(_) produces an error.

Everything works fine after I do reset('_'); however, it has been necessary to do this reset each time my students use SMC.

This issue is pretty widespread, but I don't think all my students experience it (not sure about this).

Has anyone else run into this?

Aaron

P.S. Of course, it's possible to avoid using the underscore entirely. But solve(derivative(x^2+y^2==25,x),derivative(y,x)) intimidates my students enough as it is without adding a show at the front (and another set of parentheses).

[William Stein]

Thanks - I've created an issue: https://github.com/sagemathinc/smc/issues/1107

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Best Regards,
William Stein

CEO, SageMath, Inc.

[William Stein]

Aaron,

This _ bug is now fixed (requires project restart if project is long running).

This was caused by us fixing show_identifiers() to properly only show newly defined variables.

 -- William

[Aaron Tresham]

Great! Thank you. My students will be happy.

On Sunday, October 23, 2016 at 8:15:35 AM UTC-10, William Stein wrote:

Aaron,

This _ bug is now fixed (requires project restart if project is long running).

This was caused by us fixing show_identifiers() to properly only show newly defined variables.

 -- William

On Sat, Oct 22, 2016 at 12:03 PM, William Stein <wst...@sagemath.com> wrote:

Thanks - I've created an issue: https://github.com/sagemathinc/smc/issues/1107

On Sat, Oct 22, 2016 at 11:37 AM, Aaron Tresham <atre...@gmail.com> wrote:

For the last two weeks, many of my students have run into problems when using the underscore in SMC.

As I understand it, Python automatically writes the last output to _, so we might compute a derivative and then do show(_) to make it look nicer. Or perhaps we do a calculation and then do N(_) to convert to a decimal.

Anyway, for about two weeks both of these have failed. show(_) produces a strange list of SMC related words, while N(_) produces an error.

Everything works fine after I do reset('_'); however, it has been necessary to do this reset each time my students use SMC.

This issue is pretty widespread, but I don't think all my students experience it (not sure about this).

Has anyone else run into this?

Aaron

P.S. Of course, it's possible to avoid using the underscore entirely. But solve(derivative(x^2+y^2==25,x),derivative(y,x)) intimidates my students enough as it is without adding a show at the front (and another set of parentheses).

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For more options, visit https://groups.google.com/d/optout.

--

Best Regards,
William Stein

CEO, SageMath, Inc.