Created on 2020-07-25 11:58 by philiprbrenan@gmail.com, last changed 2020-07-25 13:49 by eric.smith. This issue is now closed.
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| msg374252 - (view) | Author: Philip R Brenan (philiprbrenan@gmail.com) | Date: 2020-07-25 11:58 | |
a = false # Traceback (most recent call last): # File "test.py", line 1, in <module> # a = false # NameError: name 'false' is not defined # Compilation finished successfully. Please make this a syntax error rather than a run time error as the user intention is obvious and there cannot possibly be a variable called 'false' yet. |
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| msg374254 - (view) | Author: wyz23x2 (wyz23x2) * | Date: 2020-07-25 12:21 | |
There is nothing *wrong* with the syntax; it's just a regular assignment. It's not something like `False = 4` or `while = 6` which '=' is invalid. |
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| msg374257 - (view) | Author: Ronald Oussoren (ronaldoussoren) *  |
Date: 2020-07-25 12:30 | |
The compiler cannot know if "false" is an existing name when compiling. One example is that the name might refer to the name of a builtin. |
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| msg374268 - (view) | Author: Eric V. Smith (eric.smith) * |
Date: 2020-07-25 13:49 | |
As an example of why it's not possible for the compiler to treat this as a syntax error: I use python for my config files. Before I load these files, I inject names into the builtins, so that the config files can reference them. Some of these are constants, others are callbacks. "false" or anything else could be one of the injected names. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2020-07-25 13:49:41 | eric.smith | set | nosy:
+ eric.smith messages: + msg374268 |
| 2020-07-25 12:30:25 | ronaldoussoren | set | status: open -> closed type: compile error -> behavior nosy: + ronaldoussoren messages: + msg374257 resolution: not a bug stage: resolved |
| 2020-07-25 12:21:38 | wyz23x2 | set | title: SyntaxError rather than NameError error -> SyntaxError rather than NameError |
| 2020-07-25 12:21:28 | wyz23x2 | set | nosy:
+ wyz23x2 messages: + msg374254 title: Syntax error rather than run time error -> SyntaxError rather than NameError error |
| 2020-07-25 11:58:35 | philiprbrenan@gmail.com | create | |