polars_core/frame/
upstream_traits.rs

1use std::ops::{Index, Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive};
2
3use arrow::record_batch::RecordBatchT;
4
5use crate::prelude::*;
6
7impl FromIterator<Series> for DataFrame {
8    /// # Panics
9    ///
10    /// Panics if Series have different lengths.
11    fn from_iter<T: IntoIterator<Item = Series>>(iter: T) -> Self {
12        let v = iter.into_iter().map(Column::from).collect();
13        DataFrame::new(v).expect("could not create DataFrame from iterator")
14    }
15}
16
17impl FromIterator<Column> for DataFrame {
18    /// # Panics
19    ///
20    /// Panics if Column have different lengths.
21    fn from_iter<T: IntoIterator<Item = Column>>(iter: T) -> Self {
22        let v = iter.into_iter().collect();
23        DataFrame::new(v).expect("could not create DataFrame from iterator")
24    }
25}
26
27impl TryExtend<RecordBatchT<Box<dyn Array>>> for DataFrame {
28    fn try_extend<I: IntoIterator<Item = RecordBatchT<Box<dyn Array>>>>(
29        &mut self,
30        iter: I,
31    ) -> PolarsResult<()> {
32        for record_batch in iter {
33            self.append_record_batch(record_batch)?;
34        }
35
36        Ok(())
37    }
38}
39
40impl TryExtend<PolarsResult<RecordBatchT<Box<dyn Array>>>> for DataFrame {
41    fn try_extend<I: IntoIterator<Item = PolarsResult<RecordBatchT<Box<dyn Array>>>>>(
42        &mut self,
43        iter: I,
44    ) -> PolarsResult<()> {
45        for record_batch in iter {
46            self.append_record_batch(record_batch?)?;
47        }
48
49        Ok(())
50    }
51}
52
53impl Index<usize> for DataFrame {
54    type Output = Column;
55
56    fn index(&self, index: usize) -> &Self::Output {
57        &self.columns[index]
58    }
59}
60
61macro_rules! impl_ranges {
62    ($range_type:ty) => {
63        impl Index<$range_type> for DataFrame {
64            type Output = [Column];
65
66            fn index(&self, index: $range_type) -> &Self::Output {
67                &self.columns[index]
68            }
69        }
70    };
71}
72
73impl_ranges!(Range<usize>);
74impl_ranges!(RangeInclusive<usize>);
75impl_ranges!(RangeFrom<usize>);
76impl_ranges!(RangeTo<usize>);
77impl_ranges!(RangeToInclusive<usize>);
78impl_ranges!(RangeFull);
79
80// we don't implement Borrow<str> or AsRef<str> as upstream crates may add impl of trait for usize.
81impl Index<&str> for DataFrame {
82    type Output = Column;
83
84    fn index(&self, index: &str) -> &Self::Output {
85        let idx = self.check_name_to_idx(index).unwrap();
86        &self.columns[idx]
87    }
88}
polars_core/frame/upstream_traits.rs

polars_core/frame/
upstream_traits.rs
