Roel Schroeven <roel@roelschroeven.net> writes:
:I wouldn't say "i *should* also disappear". There is no big book of :programming language design with rules like that that all languages have
:to follow. Different languages have different behavior. In some
:languages, for/if/while statements introduce a new scope, in other
:languages they don't. In Python, they don't. I won't say one is better
:than the other; they're just different.

From the point of view of purity, the scope of names should
be a small as possible.

... but not smaller! From the standpoint of practicality,
I remember that I need the last value of the loop variable often
enough after the end of the loop that it should remain available.

And I think, in BASIC, it's available too.

LIST

10 FOR I = 1 TO 2
20 PRINT I
30 NEXT I
40 PRINT I
50 END

RUN

1
2
3

Yes!

However, it is not clear whether it's 2 or 3.

In C,

main.c

#include <stdio.h>
int main( void )
{ int j;
for( j = 1; j < 3; ++j )printf( "%d\n", j );
printf( "%d\n", j );
for( int i = 1; i < 3; ++i )printf( "%d\n", i ); /*
printf( "%d\n", i ); // error: 'i' undeclared */ }

transcript

1
2
3
1
2

Similar to Basic.

In Pascal,

TMP.PAS

PROGRAM TMP( OUTPUT );
VAR I: INTEGER;
BEGIN
FOR I:=1 TO 2 DO
WRITELN( I );
WRITELN( I )
END.

OUTPUT

1
2
2

tmp.py

for i in range( 1, 3 ): print( i )
print( i )

sys.stdout

1
2
2

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