Fix slowdown in DataFrame repr in jupyter notebook

[galipremsagar]

Description

Fixes: #15747

This PR fixes slow-down in DataFrame repr inside a jupyter notebook.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[Matt711]

These changes LGTM. I checked that the dataframe in the original issue "hangs" for me without the _ipython_canary_method_should_not_exist_ method raising an AttributeError and doesn't hang when it does. Do you why that is?

Also, do we need to something similar for pd.Series?

[galipremsagar]

These changes LGTM. I checked that the dataframe in the original issue "hangs" for me without the _ipython_canary_method_should_not_exist_ method raising an AttributeError and doesn't hang when it does. Do you why that is?

It is because of this: #16656 (comment)

Also, do we need to something similar for pd.Series?

Nope, Series doesn't have a repr_html, and doesn't seem to have the hangs either.

[galipremsagar]

/merge