Programming in Python: Books and eBooks

There are some Python programming books available online, with full text, from other sources as well. Here are a few:

• LibreTexts - Computer Science lessens the burden of student costs by providing open access texts kept up-to-date by students, faculty, and outside experts. Started by UC Davis. 
• Open Textbook Library is a comprehensive resource offered by the University of Minnesota for openly licensed academic textbooks. All textbooks are free, and the majority are peer reviewed. 
• Python.org Introductory-Level Book List