boxes.py with correctish use of oop

import os
class box:
    def __init__(self, text):
        t = []
        maxlen = []
        text = text.split("[p]")
        for i in range(len(text)):
            text[i] = text[i].split('[l]')
            maxlen.append(max(len(line) for line in text[i]))
            if i == 0:
                t.append(' '+'_'*(maxlen[i]+2))
            elif maxlen[i-1] < maxlen[i]:
                t.append('|'+'_'*(maxlen[i-1]+2)+'|'+'_'*(maxlen[i]-maxlen[i-1]-1))
            else:
                t.append('|'+'_'*(maxlen[i-1]+2)+'|')
            t.append('|'+' '*(maxlen[i]+2)+'|')
            for line in text[i]:
                t.append('| '+line+' '*(maxlen[i]+1-len(line))+'|')
        t.append('|'+'_'*(maxlen[len(text)-1]+2)+'|')
        self.t = t
        del t, maxlen, i
    def output(self):
        for line in self.t:
            print(line)

if __name__ == '__main__':
    a = box('this is the first box\
[l]as you can see\
[p]now you\'re reading the content from the second box\
[p]we just switched to the third box\
[l]not as large a box\
[l]though slightly higher\
[l]you can see that even though\
[l]it goes on and on\
[l]nothing broke yet\
[l](well i hope so at least)\
[p]anyway we reached the last box\
[l]so it\'s time for good byes')
    a.output()
    if 'win' in os.sys.platform:
        os.system('PAUSE')

===========================================================

$ python boxes.py
 _______________________
|                       |
| this is the first box |
| as you can see        |
|_______________________|____________________________
|                                                    |
| now you're reading the content from the second box |
|____________________________________________________|
|                                   |
| we just switched to the third box |
| not as large a box                |
| though slightly higher            |
| you can see that even though      |
| it goes on and on                 |
| nothing broke yet                 |
| (well i hope so at least)         |
|___________________________________|
|                                |
| anyway we reached the last box |
| so it's time for good byes     |
|________________________________|