Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Read CSV Using Polars in Python
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Read CSV Files Using Polars in Rust
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Tips and Traps¶
LazyCsvReader is more limited compared to CsvReader. CsvReader support specifying schema while LazyCsvReader does not.
An empty filed is parsed as
null
instead of an empty string by default. And there is no way to change this behavior at this time. Please refer to this issue
Read and Write CSV Files in Rust
Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Tips and Traps¶
By defaut,
csv::Reader
requires headers.When the csv crate is used together with the serde crate for deserialization, CSV files to be parsed have to be strictly well formatted. For example, the headers in CSV files have to match the defintion in the serde struct. Otherwise, the code will panic with an error of "missing fields".
Read/Write CSV in Spark
Read/Write CSV in PySpark
Load Data in CSV Format¶
.load
is a general method for reading data in different format. You have to specify the format of the data via the method.format
of course..csv
(both for CSV and TSV),.json
and.parquet
are specializations of.load
..format
is optional if you use a specific loading function (csv, json, etc.).