python-pandas如何查看某列无重复的值

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import pandas as pd

air = pd.read_csv("../data/sq_air.csv", dtype={'station_id': str})
print("air:{}".format(air.shape))  # air:(341, 13)

# Hash table-based unique
# Uniques are returned in order of appearance
# This does NOT sort
print(air['station_id'].unique())  # ['244002' '244003' '244001']