如何从csv获取唯一值？

import pandas as pd

# 读取CSV文件
df = pd.read_csv('yourfile.csv')

# 获取某一列的唯一值
unique_values = df['column_name'].unique()

# 打印唯一值
print(unique_values)

import csv

unique_values = set()

with open('yourfile.csv', newline='') as csvfile:
    reader = csv.DictReader(csvfile)
    for row in reader:
        unique_values.add(row['column_name'])

# 打印唯一值
print(unique_values)

import dask.dataframe as dd

# 分块读取CSV文件
ddf = dd.read_csv('yourfile.csv')

# 获取某一列的唯一值
unique_values = ddf['column_name'].unique().compute()

# 打印唯一值
print(unique_values)