polars::prelude

Struct CsvReader

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pub struct CsvReader<R>
where R: MmapBytesReader,
{ /* private fields */ }
Available on crate feature polars-io only.
Expand description

Create a new DataFrame by reading a csv file.

§Example

use polars_core::prelude::*;
use polars_io::prelude::*;
use std::fs::File;

fn example() -> PolarsResult<DataFrame> {
    CsvReadOptions::default()
            .with_has_header(true)
            .try_into_reader_with_file_path(Some("iris.csv".into()))?
            .finish()
}

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Trait Implementations§

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impl<R> SerReader<R> for CsvReader<R>
where R: MmapBytesReader,

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fn new(reader: R) -> CsvReader<R>

Create a new CsvReader from a file/stream using default read options. To use non-default read options, first construct CsvReadOptions and then use any of the (try)_into_ methods.

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fn finish(self) -> Result<DataFrame, PolarsError>

Read the file and create the DataFrame.

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fn set_rechunk(self, _rechunk: bool) -> Self
where Self: Sized,

Make sure that all columns are contiguous in memory by aggregating the chunks into a single array.

Auto Trait Implementations§

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impl<R> Freeze for CsvReader<R>
where R: Freeze,

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impl<R> !RefUnwindSafe for CsvReader<R>

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impl<R> Send for CsvReader<R>

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impl<R> Sync for CsvReader<R>

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impl<R> Unpin for CsvReader<R>
where R: Unpin,

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impl<R> !UnwindSafe for CsvReader<R>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V