Polarsで日時を扱う

型

Date

e.g. 2014-07-08

内部では32bitのUNIX時間で表される

Datetime

e.g. 2014-07-08 07:00:00

内部では64bitのUNIX時間で表される

Duration

A time delta type that is created when subtracting Date/Datetime.

Similar to timedelta in Python.

Time

Time representation, internally represented as nanoseconds since midnight.

code:py

df = pl.read_csv("docs/assets/data/apple_stock.csv", try_parse_dates=True)

cast

code:py

df = df.with_columns(pl.col("Date").str.to_date("%Y-%m-%d"))

code:py

df_with_year = df.with_columns(pl.col("Date").dt.year().alias("year"))

code:py

from datetime import datetime

範囲

code:py

filtered_range_df = df.filter(

pl.col("Date").is_between(datetime(1995, 7, 1), datetime(1995, 11, 1)),

)

print(filtered_range_df)