how to move cursor in Interactive Interpreter

[yan.python at gmail.com]

i  have a question.
when i run Interactive Interpreter in linux command promt,how can i
move the cursor.
for example,when i enter a string,i often enter the quotation mark ""
first,and the move the cursor inside the mark to enter the string,in
windows,it is ok.but when i do that in linux,pressing the "left" key
will just print "^[[D" in the screen ,but not what i want.
so , how can i move the cursor Interactive Interpreter in linux?
 i've googled and find nothing useful.who i tell me what to do?