Merge() missing 1 required positional argument: ‘right’

Explanation:

The error message you encountered is related to the merge() function in Python. The merge() function is used to combine two or more data frames or series into a single data frame. However, it seems that you are missing a required positional argument right while using the merge() function.

The correct syntax for using the merge() function is:

merged_df = pd.merge(left, right, on='common_column')

• left and right are the data frames or series that you want to merge.
• on is the common column between the two data frames on which you want to merge.

Example:

Let’s consider two data frames df1 and df2:

import pandas as pd

df1 = pd.DataFrame({'A': [1, 2, 3],
                    'B': ['a', 'b', 'c']})

df2 = pd.DataFrame({'A': [4, 5, 6],
                    'B': ['d', 'e', 'f']})

If we try to merge these data frames without providing the right argument, it will result in the mentioned error:

merged_df = pd.merge(df1)  # Error: merge() missing 1 required positional argument: 'right'

To fix this error, we need to provide the right argument which specifies the data frame we want to merge with:

merged_df = pd.merge(df1, df2, on='A')

The resulting merged_df will be:

   A B_x B_y
0  1   a   d
1  2   b   e
2  3   c   f

Here, the B_x and B_y columns represent the corresponding values from df1 and df2 respectively, and the A column serves as the common column that was provided in the on argument.