At the interactive prompt, a result is printed when both these things
are true:
* The entered code is an expression, not any other kind of statement
* The result of the expression is not 'None'
If an expression occurs, information about it will be printed instead.
So the interpreter won't print a result for
>>> a = 3 # because it's an assignment statement
>>> def f(): return # because it's a 'def' statement
>>> None # because the result of the expression is 'None'
>>> f() # because the result of the expression is 'None'
Your example
>>> int a
is not Python, but if it was it would probably be a non-expression
statement, and thus never print a result in the interpreter.
Jeff
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