Terry J. Reedy added the comment:
Easy test case using -c:
\python_d.exe -m idlelib.idle -c "from __future__ import division; print(1/2)"
>>>
0.5
>>> 1/2
0
>>> division
_Feature((2, 2, 0, 'alpha', 2), (3, 0, 0, 'alpha', 0), 8192)
Replace "-m idlelib.idle" with "-i" to get interactive interpreter and >>> 1/2
is .5 instead of 0.
---
Implementation of -s in PyShell.py
if o == '-s': startup = True # line 1504
if startup: # line 1586
filename = ...
if filename ...
... execfile(filename)
execfile (line 650) is the same method used to run -c and -r code. After
compiling code, it calls runcode (779). That normally sends the code to the
user process, but may run code in the debugger or in the idle process. When
the future import is run, it is just an import and not also a 'from __future__'
statement.
Editor files are compiled in ScriptBinding.ScriptBinding.checksyntax. This is
why not affected by __future__ import in PyShell (#24222). Run_module_event
calls (interp.)runcode, as above.
I believe Shell input is run by .runsource, which is called by .runit, which is
called when appropriate by the <enter> callback.
.runsource in turn calls the base class method
code.InteractiveInterpreter.runsource, which uses 'self.compile', which is an
instance of codeop.CommandCompiler. codeop.CommandCompiler indirectly uses
'self.compiler', which is an instance of codeop.Compiler. The latter is what
actually calls the builtin function compile, with self.flags (futures
imported), it updates self.flags from the flags in the code returned by compile.
So I believe the solution is for the ExtendedInterpreter instance to get a
reference to the Compiler instance, after InteractiveInterpreter is
initialized, and call that, with symbol='exec' instead of 'single', instead of
calling compile directly.
A reason not to use the same pipeline as for statements enter interactively is
that there is extra code to account for the possibility of compiling correct
partial statements. "while True:\n" is not an error at a prompt, since more may
follow, but is as a complete code string.
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<http://bugs.python.org/issue22893>
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