- read_csv: 读取文件
- pl.read_csv(« data.csv »)
- write_csv: 写文件
- pl.write_csv(« output.csv »)
- Dataframe:
-
df = pl.DataFrame({‘name’: [‘Alice’, ‘Bob’, ‘Charlie’],‘age’: [25, 30, 28],‘city’: [‘Beijing’, ‘Shanghai’, ‘Shenzhen’]})
-
- filter 筛选
- df_filtered = df.filter(pl.col(‘age’) > 30 )
- sort 生序
- df_sorted = df.sort(« age »)
- groupby
- df_grouped = df.groupby(‘city’).agg([pl.col(« age »).mean().alias(« average_age »)])
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