Character-Separated Values
Read & Write
Reading a CSV file should look familiar:
df = pl.read_csv("path.csv")
CSV files come in many different flavors, so make sure to check the
read_csv()
API.
Writing to a CSV file can be done with the
write_csv()
method.
df = pl.DataFrame({"foo": [1, 2, 3], "bar": [None, "bak", "baz"]})
df.write_csv("path.csv")
Scan
Polars
allows you to scan a CSV input. Scanning delays the actual parsing of the file
and instead returns a lazy computation holder called a LazyFrame
.
df = pl.scan_csv("path.csv")
If you want to know why this is desirable,
you can read more about those Polars
optimizations here.