Meaning of 'w', 'r', and 'a' in Python Programming Language:

• It's really just a string with a character in it for the kind of mode for the file.

• If you use 'w', then you are saying "open this file in 'write mode" - hence the 'w' character.

• There's also 'r' for "read," 'a' for append, and modifiers on these.