If you encounter the KeyError: 'label [column_name] not contained in axis'
error message when using the drop()
method in Pandas, it means that the specified column or row label does not exist in the axis (either columns or rows) that you are trying to drop.
Here are a few possible reasons why this error might occur, along with some solutions:
Misspelled column name: Check if you have misspelled the column name. Double-check the column names using the
columns
attribute of the DataFrame.Trying to drop a row label as a column or vice versa: Make sure you are using the
axis
parameter correctly. If you are trying to drop a row label, set theaxis
parameter to 0, and if you are trying to drop a column label, set theaxis
parameter to 1.The DataFrame contains a MultiIndex: If the DataFrame has a MultiIndex, make sure you specify the correct level or levels to drop using the
level
parameter.The DataFrame is empty: If the DataFrame is empty, it does not have any columns or rows to drop. Check if your DataFrame is empty before trying to drop a column or row.
Column is already dropped: If you have already dropped the column and try to drop it again, this error will occur. Double-check if you have already dropped the column in the previous code lines.
If none of these solutions work, try checking the version of Pandas you are using, or provide more information about the specific DataFrame and code you are using to help identify the issue.
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