Terry J. Reedy <[email protected]> added the comment:
IDLE is a Python program that wraps the Python interpreter. Before blaming
IDLE for how code is executed, one should first execute the same code directly
in Python. The example above shows that one should also try code.interact,
especially for compilaition issues. (Xie, thank you for this reminder.) IDLE
and code.interact use the same code and codeop infrastructure. Most relevant
here is codeop.CommandCompiler, which should act the same as
codeop.compile_command in the absence of __future__ imports.
The codeop functions, including _maybe_compile, are intended to imitate in
python the C REPL code that decides whether to execute, get more input, or
raise. It doesn't always. (I think it would be good if a C expert compared it
to the *current* C code.)
>>> CC = codeop.CommandCompiler
>>> cc("print([1,") # Returns None, meaning, 'Get more input'.
>>> cc("print([1,\n2,")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "F:\dev\3x\lib\codeop.py", line 132, in compile_command
return _maybe_compile(_compile, source, filename, symbol)
File "F:\dev\3x\lib\codeop.py", line 106, in _maybe_compile
raise err1
File "F:\dev\3x\lib\codeop.py", line 93, in _maybe_compile
code1 = compiler(source + "\n", filename, symbol)
File "F:\dev\3x\lib\codeop.py", line 111, in _compile
return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT)
File "<input>", line 1
print([1,
^
SyntaxError: '[' was never closed
If the opening '[' is removed, then ']' is replaced with (. If '[' is replaced
with '{' and the items adjusted, ']' is replaced with '}'. In all three cases,
CC should return None to ask for more, as the REPL does.
----------
components: -IDLE
nosy: +pablogsal
title: code.interact() unexpectedly raises exception when there may be more
code -> codeop prematurely raises SyntaxError when ']' is needed
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Python tracker <[email protected]>
<https://bugs.python.org/issue43163>
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