Pandas Merging 101

Here is an example of how to use the pd.merge() function to merge two DataFrames in pandas:

Python: merge two DataFrames in pandas

import pandas as pd

# Create two DataFrames
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]})

# Use pd.merge() to merge the DataFrames on the 'key' column
merged_df = pd.merge(df1, df2, on='key')

print(merged_df)

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This will output the following DataFrame:

key  value_x  value_y
0   B        2        5
1   D        4        6

Note that the value columns from each DataFrame are now labeled as value_x and value_y to distinguish them in the merged DataFrame.