Michał Radwański added the comment:
Docs mention:
ast.parse(source, filename='<unknown>', mode='exec')
Parse the source into an AST node. Equivalent to compile(source, filename,
mode, ast.PyCF_ONLY_AST).
If you just parse code into AST, you first check whether it is possible to turn
such source into a Python syntax tree. In that case, it obviously is, as you
may imagine a function, that returns nothing:
def func():
return
If however you try to make executable code of the source, it is checked whether
the constructs make sense in provided context. And, as you may imagine,
top-level code with return statement is not valid, hence the error.
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nosy: +enedil
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<http://bugs.python.org/issue30637>
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