The provided code attempts to append `row_obj_list` to the `"rows"`...

The provided code attempts to append row_obj_list to the "rows" key of a nested dictionary structure. Specifically, this dictionary structure is within res_page["week_data"][page_table_idx].

Here's the breakdown of what the code does and why you're receiving a KeyError:

Code Breakdown:

1. res_page: Presumably this is a dictionary containing the key "week_data".
2. res_page["week_data"]: Accesses the value associated with the "week_data" key; the value is likely a dictionary or list.
3. res_page["week_data"][page_table_idx]: Accesses the element indexed by page_table_idx within "week_data". If "week_data" is a dictionary, page_table_idx is expected to be a valid key. If it is a list, page_table_idx must be an integer index.
4. res_page["week_data"][page_table_idx]["rows"]: This looks for a key named "rows" in the dictionary at the location res_page["week_data"][page_table_idx].
5. Error (KeyError: 'rows'): The error means that the "rows" key does not exist, and the code cannot proceed to the append operation.

What the Code Tries to Do:

The code is attempting to:

• Access the "rows" key within the nested dictionary at res_page["week_data"][page_table_idx].
• Append row_obj_list (likely a list or similar object) to the value associated with the "rows" key.

However, since the "rows" key does not exist in that nested dictionary, Python raises a KeyError.

Why the Error Occurs:

The "rows" key is missing in res_page["week_data"][page_table_idx]. Before you can append to a list associated with a key, the key itself must exist and reference a list.

How to Fix the Code:

To fix the error, you can ensure the "rows" key exists and is initialized to a list before attempting to append. For instance:

# Ensure that the "rows" key exists and is a list
if "rows" not in res_page["week_data"][page_table_idx]:
    res_page["week_data"][page_table_idx]["rows"] = []

# Now safely append
res_page["week_data"][page_table_idx]["rows"].append(row_obj_list)

This code checks if "rows" is present; if not, it initializes it as an empty list, allowing the subsequent append to succeed without error.