Question

I am using a online console of python: http://shell.appspot.com/
I am trying to write this code:

class tree:
 def __init__(self, charge, left=None, right=None):
  self.charge = charge
  self.left = left
  self.right = right

When I wrote the first line class tree: I push enter and I get this error from the console

Traceback (most recent call last):
File "/base/data/home/apps/shell/1.335852500710379686/shell.py", line 221, in get 
compiled = compile(statement, '<string>', 'single')
File "<string>", line 2
 ^
IndentationError: expected an indented block

Does anyone could tell me how to write this piece of code?
Thanks.

Answer 1

Do not use ENTER.
As indicated at the bottom of the online shell page use:

Shift-Enter for newline