Terry J. Reedy added the comment:
If src is effectively blank, compile(src, filename, mode) raises SyntaxError if
mode is 'single' but not if it is 'exec'. I believe IDLE compiles with
'single', but it has the behavior Jim (and I) expect and consider correct,
printing '>>>' after effectively blank lines. This is because IDLE uses
code.InteractiveInterpreter, which uses codeop.compile_command, which uses
codeop._maybe_compile, which replaces effectively blank statements with 'pass'.
compile('pass', '', 'single') returns a do-nothing code object. The C-coded
interactive interpreter is doing something else.
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nosy: +terry.reedy
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<http://bugs.python.org/issue29561>
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