def IndentLevel(by=1):
 global _Level
 if ((_Level + by) < 0):
  raise Error, 'indentation underflow (internal error)'
 _Level = (_Level + by)

def IndentLevel ( by = 1 ) : global _Level if ( ( _Level + by ) < 0 ) : raise Error , 'indentation underflow (internal error)' _Level = ( _Level + by )
increment the indentation level by one .