Why True/False is capitalized in Python?

From Pep 285:

Should the constants be called ‘True’
and ‘False’ (similar to
None) or ‘true’ and ‘false’ (as in C++, Java and C99)?

=> True and False.

Most reviewers agree that consistency within Python is more
important than consistency with other languages.

This, as Andrew points out, is probably because all (most)? built-in constants are capitalized.