Reference

Read and write

read	Read data from a file.
write	Write data to a file.

File transfers

cache_url	Download and cache a URL locally.
list_remote_dir	Get a directory listing from an FTP or HTTP URL.
transmit	Download files from a remote directory.

Data sanitization

categorize	Convert columns to Categorical.
drop_nested_columns	Keep only columns containing scalar (atomic) values.
NA_STRINGS	Built-in mutable sequence.
sanitize_na	Replace NA-like strings with NaN.
sanitize_percent	Convert percent strings to numeric fractions.
uncategorize	Convert Categorical columns back to their underlying dtype.

Utilities

fill_lines	Pad delimited lines so all have equal field count.
join_url	Join strings to form a URL path.