Python - Submet DataFrame на основе уникального значения Clumn
# Keep first duplicate value
my_df = my_df.drop_duplicates(subset=['my_var'])
# Keep last duplicate value
my_df = my_df.drop_duplicates(subset=['my_var'], keep='last')
# Remove all duplicate values
my_df = my_df.drop_duplicates(subset=['my_var'], keep=False)
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