'None' is not displayed as I expected in Python interactive mode

Question

I thought the display in Python interactive mode was always equivalent to print(repr()), but this is not so for None. Is this a language feature or

Answer 1

Yes, this behaviour is intentional.

From the Python docs

7.1. Expression statements

Expression statements are used (mostly interactively) to compute and write a value, or (usually) to call a procedure (a function that returns no meaningful result; in Python, procedures return the value None). Other uses of expression statements are allowed and occasionally useful. The syntax for an expression statement is:

expression_stmt ::=  starred_expression

An expression statement evaluates the expression list (which may be a single expression).

In interactive mode, if the value is not None, it is converted to a string using the built-in repr() function and the resulting string is written to standard output on a line by itself (except if the result is None, so that procedure calls do not cause any output.)