why it is invalid syntax?

Zara yozara at terra.es
Thu Nov 22 07:58:51 CET 2007


On Thu, 22 Nov 2007 00:00:16 -0600, alf <ask at me.xs4all.nl> wrote:

>Hi,
>
>I wonder why it is an invalid syntax:
>
>
> >>> if 1: if 1: if 1: print 1
>   File "<stdin>", line 1
>     if 1: if 1: if 1: print 1
>
>
>or
>
> >>> if 1: for i in range(10): print i
>   File "<stdin>", line 1
>     if 1: for i in range(10): print i
>
>I would expect one could nest :
>

You may take a look at python documentation, Language reference, 7.
Compound statement. It clearly states that what follows the : of
if,while,for... if it is not a new line, it should be a list of simple
statements. Son no there is no : nesting.


>compound_stmt ::= if_stmt 
>  | while_stmt 
>  | for_stmt 
>  | try_stmt 
>  | with_stmt 
>  | funcdef 
>  | classdef 
>suite ::= stmt_list NEWLINE | NEWLINE INDENT statement+ DEDENT 
>statement ::= stmt_list NEWLINE | compound_stmt 
>stmt_list ::= simple_stmt (";" simple_stmt)* [";"] 
>

Regards,

Zara




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