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devel / comp.lang.python / Re: learning python ...

SubjectAuthor
* Re: learning python ...Grant Edwards
`- Re: learning python ...Greg Ewing

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Re: learning python ...

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From: grant.b....@gmail.com (Grant Edwards)
Newsgroups: comp.lang.python
Subject: Re: learning python ...
Date: Tue, 25 May 2021 13:45:59 -0000 (UTC)
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 by: Grant Edwards - Tue, 25 May 2021 13:45 UTC

On 2021-05-24, Alan Gauld via Python-list <python-list@python.org> wrote:
> On 24/05/2021 19:48, Grant Edwards wrote:
>
>>> Traceback ( File "<interactive input>", line 1
>>> if = 1.234
>>> ^
>>> SyntaxError: invalid syntax
>>
>> I must admit it might be nice if the compiler told you _why_ the
>> syntax is invalid (e.g. "expected conditional expression while parsing
>> 'if' statement").
>
> Although wouldn't it be "expected boolean expression" rather than
> conditional expression? Python doesn't care how the argument to 'if'
> is arrived at so long as it's a boolean.

Indeed -- after posting that I realized that "conditional expression"
was not the best phrase to choose because that's often used to refer
to an expression involving the new ternary operator. I should have
said "boolean valued expression". Though in the syntax for the
ternary operator expression I've seen such a boolean valued expression
called a "conditional expression".

https://realpython.com/python-conditional-statements/

<expr1> if <conditional_expr> else <expr2>

Re: learning python ...

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From: greg.ew...@canterbury.ac.nz (Greg Ewing)
Newsgroups: comp.lang.python
Subject: Re: learning python ...
Date: Wed, 26 May 2021 10:44:17 +1200
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 by: Greg Ewing - Tue, 25 May 2021 22:44 UTC

> On 2021-05-24, Alan Gauld via Python-list <python-list@python.org> wrote:
>> Although wouldn't it be "expected boolean expression" rather than
>> conditional expression? Python doesn't care how the argument to 'if'
>> is arrived at so long as it's a boolean.

This isn't really true either. Almost every object in Python has
an interpretation as true or false, and can be used wherever a
boolean value is needed.

--
Greg

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