What is the history of capitalizing None, True, and False in Python?

Question

In Python, there are some of the objects of such value: True, False, None.

>>> type(True)
<type 'bool'>
>>> type(None)
<type 'NoneType'>
>>>

As with the current PEP-8 style guide, it is recommended that you write instances and variable names in lower case, what is the history of writing these objects, like a value, in capital letters?

It is said / commented that built-in functions are capitalized, but what is their rationale and inspiration? Most languages ​​have all uppercase letters embedded, so can you expect Python to follow this paradigm?

Answer 1

Python - , . True False , , , , . , , , , , , , .