python - How to clear variables in ipython?

Question

Sometimes I rerun a script within the same ipython session and I get bad surprises when variables haven't been cleared. How do I clear all variables? And is it possible to force this somehow every time I invoke the magic command %run?

Thanks

Answer 1

%reset seems to clear defined variables.

Answer 2

EDITED after @ErdemKAYA comment.

To erase a variable, use the magic command:

%reset_selective <regular_expression>

The variables that are erased from the namespace are the one matching the given <regular_expression>.

Therefore

%reset_selective -f a 

will erase all the variables containing an a.

Instead, to erase only a and not aa:

In: a, aa = 1, 2
In: %reset_selective -f "^a$"
In: a  # raise NameError
In: aa  # returns 2

see as well %reset_selective? for more examples and https://regexone.com/ for a regex tutorial.

To erase all the variables in the namespace see:

%reset?

Answer 3

In iPython you can remove a single variable like this:

del x

Answer 4

I tried

%reset -f

and cleared all the variables and contents without prompt. -f does the force action on the given command without prompting for yes/no.

Wish this helps.. :)

Answer 5

Adding the following lines to a new script will clear all variables each time you rerun the script:

from IPython import get_ipython
get_ipython().magic('reset -sf') 

To make life easy, you can add them to your default template.

In Spyder: Tools>Preferences>Editor>Edit template

Answer 6

Apart from the methods mentioned earlier. You can also use the command del to remove multiple variables

del variable1,variable2

Answer 7

An quit option in the Console Panel will also clear all variables in variable explorer

*** Note that you will be loosing all the code which you have run in Console Panel