import pandas as pd


def merge_csv(csv1, csv2, left_key, right_key, merge_type):
    left = pd.read_csv(csv1)
    right = pd.read_csv(csv2)
    merged_df = left.merge(right, how=merge_type, left_on=left_key, right_on=right_key)
    return merged_df


if __name__ == '__main__':
    csv1 = 'file1.csv'
    csv2 = 'fil2.csv'
    mergeed_cvs = merge_csv(csv1, csv2, 'id', 'user_id', 'inner')

    print(mergeed_cvs.head())