Revisioni di Polars-readme-2.py

1 file changed, 33 insertions

Polars-readme-2.py(file creato)

		@@ -0,0 +1,33 @@
1	+	>>> df = pl.scan_csv("docs/assets/data/iris.csv")
2	+	>>> ## OPTION 1
3	+	>>> # run SQL queries on frame-level
4	+	>>> df.sql("""
5	+	... SELECT species,
6	+	... AVG(sepal_length) AS avg_sepal_length
7	+	... FROM self
8	+	... GROUP BY species
9	+	... """).collect()
10	+	shape: (3, 2)
11	+	┌────────────┬──────────────────┐
12	+	│ species ┆ avg_sepal_length │
13	+	│ --- ┆ --- │
14	+	│ str ┆ f64 │
15	+	╞════════════╪══════════════════╡
16	+	│ Virginica ┆ 6.588 │
17	+	│ Versicolor ┆ 5.936 │
18	+	│ Setosa ┆ 5.006 │
19	+	└────────────┴──────────────────┘
20	+	>>> ## OPTION 2
21	+	>>> # use pl.sql() to operate on the global context
22	+	>>> df2 = pl.LazyFrame({
23	+	... "species": ["Setosa", "Versicolor", "Virginica"],
24	+	... "blooming_season": ["Spring", "Summer", "Fall"]
25	+	...})
26	+	>>> pl.sql("""
27	+	... SELECT df.species,
28	+	... AVG(df.sepal_length) AS avg_sepal_length,
29	+	... df2.blooming_season
30	+	... FROM df
31	+	... LEFT JOIN df2 ON df.species = df2.species
32	+	... GROUP BY df.species, df2.blooming_season
33	+	... """).collect()

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