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IDLE and the interactive interpreter both wrongly reports a SyntaxError if no blank line after function definition. #93307

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stevendaprano opened this issue May 28, 2022 · 2 comments
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IDLE and the interactive interpreter both wrongly reports a SyntaxError if no blank line after function definition. #93307

stevendaprano opened this issue May 28, 2022 · 2 comments
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type-bug An unexpected behavior, bug, or error

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@stevendaprano
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stevendaprano commented May 28, 2022 •
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See discussion here. Note that the code sample sent by Ron was correctly formatted in email, but has lost all indentation in the Discuss website.

Rename the attached noblank.txt to noblank.py. (Github will not allow you to upload .py files!)

Run the renamed noblank.py file from the command line, e.g. python3.10 noblank.py. Note that it will run correctly from the vanilla Python interpreter. But it fails if copied and pasted into the interactive interpreter or IDLE.

Steps to reproduce

  1. Launch IDLE, or the CPython interactive interpreter.
  2. Copy the contents of noblank.py using your preferred text editor.
  3. Paste it at the >>> prompt.
  4. The interactive interpreter and IDLE both report a syntax error: SyntaxError: invalid syntax.

Expected behaviour

Preferably, the code should run and print "no blank" as it does in the non-interactive interpreter. If that is not possible, it should report a better error message, such as mentioning an unexpected outdent and suggesting that a blank line should be inserted.

  • CPython versions tested on: 3.10 on Linux.

noblank.txt
@stevendaprano stevendaprano added the type-bug An unexpected behavior, bug, or error label May 28, 2022
@stevendaprano stevendaprano mentioned this issue May 28, 2022
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@aroberge
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This seems to be a bug in the code module, and not in IDLE per se.

>>> import code
>>> code.interact()
Python 3.10.2 ...
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> def noblank():
...     print("no blank")
... noblank()  # No blank line.
  File "<console>", line 3
    noblank()  # No blank line.
    ^^^^^^^
SyntaxError: invalid syntax

Tested in 3.6 to 3.11, and always got the same traceback.

@terryjreedy
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(Stephen, please don't put 3 line examples in a separate file. Use a triple-backquoted block like Andre' did.)

In interactive mode, one must enter a single statement for each primary prompt. The example has 2 statements. Compound statements must be terminated with a blank. From Tutorial 3.2: "When a compound statement is entered interactively, it must be followed by a blank line to indicate completion (since the parser cannot guess when you have typed the last line)." The error is correct.

@terryjreedy terryjreedy closed this as not planned Won't fix, can't repro, duplicate, stale Jul 23, 2022
@erlend-aasland erlend-aasland moved this to Done in IDLE Issues Jul 27, 2022
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@aroberge @terryjreedy @stevendaprano @AlexWaygood