On 2009-05-30 21:02, Greg Ewing wrote:
Robert Kern wrote:
The 'single' mode, which is used for the REPL, is a bit different than
'exec', which is used for modules. This difference lets you insert
"blank" lines of whitespace into a function definition without exiting
the definition.
All that means is that the REPL needs to keep reading
lines until it gets a completely blank one. I don't
see why the compiler has to treat the source any
differently once the REPL has decided how much text
to feed it.
Not true. The REPL will keep reading lines until
compile(code,'<string>','single') passes without a SyntaxError. You can put in
blank lines when line continuation is implicit, like in the middle of a list.
This is the reason that there is a 'single' mode in the first place, to
determine when you've stopped typing. It's easier to add the grammar rule that a
block does not end with a line of whitespace to the compiler than to implement
all of the context-specific special cases for pure empty lines outside of the
compiler.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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