DOC: fix EX03 Errors for pandas.DataFrame.to_sql

[erichxchen]

• Ref: DOC: fix EX03 errors in docstrings #56804

Fix these EX03 Errors for pandas.DataFrame.to_sql:

9 Errors found for `pandas.DataFrame.to_sql`:
        flake8 error: line 8, col 4: E111 indentation is not a multiple of 4
        flake8 error: line 15, col 4: E111 indentation is not a multiple of 4
        flake8 error: line 19, col 4: E111 indentation is not a multiple of 4
        flake8 error: line 27, col 1: F821 undefined name 'df_conflict'
        flake8 error: line 27, col 89: E501 line too long (124 > 88 characters)
        flake8 error: line 28, col 1: F811 redefinition of unused 'insert' from line 22
        flake8 error: line 39, col 1: F821 undefined name 'df_conflict'
        flake8 error: line 39, col 89: E501 line too long (123 > 88 characters)
        flake8 error: line 46, col 3: E111 indentation is not a multiple of 4

[datapythonista]

Nice changes, just one comment. The error seems to suggest that insert is already imported before but never used. Can you have a look, and remove the previous import if that's really the case.

[erichxchen]

It's actually used in L3036:

...     stmt = insert(table.table).values(data).on_conflict_do_nothing(index_elements=["a"])

I am not quite sure why it shows this error, but I think we could just # doctest: +SKIP this line

[datapythonista]

Ok, fair enough. Not sure if another option would be to remove this line. But having the skip is fine if there is no other obvious solution.

I'll resolve the conflict and let someone else review, so we have a second opinion, but this looks good to me.

[natmokval]

@erichxchen, thank you for working on this. I think, there are some errors left that need to be fixed:

5 Errors found for `pandas.DataFrame.to_sql`:
        EX03    flake8 error: line 27, col 1: F821 undefined name 'df_conflict'
        EX03    flake8 error: line 27, col 89: E501 line too long (124 > 88 characters)
        EX03    flake8 error: line 28, col 1: F811 redefinition of unused 'insert' from line 22
        EX03    flake8 error: line 39, col 1: F821 undefined name 'df_conflict'
        EX03    flake8 error: line 39, col 89: E501 line too long (123 > 88 characters)

For example, the line

pandas/pandas/core/generic.py

Line 3041 in 02011f2

>>> df_conflict.to_sql(name="conflict_table", con=conn, if_exists="append", method=insert_on_conflict_nothing) # doctest: +SKIP

is too long. Could you please rewrite it as multi-line statement? It will fix one of the errors.

[mroeschke]

Closed by #57025