#!/bin/env python

class Vector(object):
  # constructor
  def __init__(self, coord):
    self.coord = coord  
  # turns the object into string
  # use <> as brackets, and ; as separator
  def __str__(self):
    s = "<"
    if len(self.coord)==0:
        return s+">"
    else:
        s = s+str(self.coord[0])
    for x in self.coord[1:]:
        s = s+";"+str(x);
    return s+">"

v1 = Vector([1,2,3])
# performs conversion to string as above
print (v1)