Internal utilities

Internal utilities for pyisbn.

pyisbn._utils.isbn_cleanse(isbn, *, checksum=True)

Check ISBN is a string, and passes basic sanity checks.

Parameters:

• isbn (TIsbn (str)) – SBN, ISBN-10 or ISBN-13

• checksum (bool) – True if isbn includes checksum character

Return type:

str

Returns:

ISBN with hyphenation removed, including when called with a SBN

Raises:

• TypeError – isbn is not a str type

• IsbnError – Incorrect length for isbn

• IsbnError – Incorrect SBN or ISBN formatting