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#{
Indentation mark:
  @x: where x=1,2,...,9, 
  tokens followed with the same indentation mark
  must be aligned with the same indentation;

Indented code block:
  $IBL prefixed variable matches a block of indented codes;

String literal from tokens:
  Tokens expanded for patterns between a pair of \" or \',
  are concatenated into a string literal enclosed in the
  corresponding quotation mark. A space is inserted between
  to consecutive identifer tokens.
#}

syntax{ # if : elif : else :
  if @1 $EXP_1 : \[ $IBL_1 \]
  \{ elif @1 $EXP_2 : \[ $IBL_2 \] \} 
  \[ else @1 : \[ $IBL_3 \] \]

}as{ # if(){}elif(){}else{}
  if( 1 ){ # extra nesting to avoid the inside messing up with the outside
    if( $EXP_1 ){ \[ $IBL_1 \] }
    \{ elif( $EXP_2 ){ \[ $IBL_2 \] } \}
    \[ else{ \[ $IBL_3 \] } \]
  }
}
syntax{ # for in :
  for $ID_1 in $EXP_1 \{ , $ID_2 in $EXP_2 \} : \[ $IBL_1 \]
}as{ # for( in ){}
  for( $ID_1 in $EXP_1 \{ ; $ID_2 in $EXP_2 \} ){ \[ $IBL_1 \] }
  io.writeln( \" \[ $IBL_1 \] \" ) 
}

a = 1
b = 0

if a == 0 :
  io.writeln( 'python "if" works!' )
  if b == 1 :
    io.writeln( 'b =', b )
elif a == 1 :
  io.writeln( 'python "if-elif" works!' )
  if b == 0 :
    io.writeln( 'b =', b )

list1 = { 1, 2, 3 }
list2 = { 'a', 'b', 'c' }

for x in list1:
  io.writeln( x )
  for y in list2:
    io.writeln( y )
    if y == 'b':
      io.writeln( y )

for x in list1 , y in list2 :
  io.writeln( x, y )