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lanx@nc10-ubuntu:~$ python
Python 2.5.2 (r252:60911, Jan 20 2010, 23:16:55) 
...
...
>>> str+="4"
>>> str
'1234'

  DB<1> $str="";$t=time;for (1..100000) {$str=$str."a"."b"};print time
+-$t
13
  DB<2> $str="";$t=time;for (1..1000000) {$str.="a";$str.="b"};print t
+ime-$t
1

>>> for i in range(1, 1000000):
...   str+="a"+"b"
...
>>> for i in range(1, 100000):
...   str=str+"a"+"b"
...

  DB<1> $t=time;for (1..10000000) {$str="";$str.="a"."b";};print time-
+$t
10
...
17
  DB<3> $t=time;for (1..10000000) {$str="";$str=$str."a"."b";};print t
+ime-$t
15