merge() got an unexpected keyword argument 'sheet_name'

The error message "merge() got an unexpected keyword argument 'sheet_name'" occurs when you are trying to use the 'sheet_name' parameter with the merge() function in pandas, but this parameter is not supported in the version of pandas you are using.

The 'sheet_name' parameter is used to specify the name of the sheet in an Excel file that you want to merge with another sheet. This parameter is only supported in pandas version 0.21.0 or later.

To solve this issue, you can either upgrade your pandas version to 0.21.0 or later, or use a different parameter to specify the sheet name, such as 'left_on' or 'right_on' depending on how you are merging the data frames.

Here is an example of how to use merge() function to merge two data frames using the 'left_on' and 'right_on' parameters to specify the columns to join on:

import pandas as pd

df1 = pd.DataFrame({'key': ['A', 'B', 'C', 'D'], 'value': [1, 2, 3, 4]})
df2 = pd.DataFrame({'key': ['B', 'D', 'E', 'F'], 'value': [5, 6, 7, 8]})

merged_df = pd.merge(df1, df2, left_on='key', right_on='key')

In this example, the data frames df1 and df2 are merged on the 'key' column using the 'left_on' and 'right_on' parameters. The resulting merged_df data frame will contain all the rows that have matching keys in both data frames.