evaluation question

[Muttley at dastardlyhq.com]

Hi

This is probably a dumb newbie question but I've just started to learn
python3 and eval() isn't behaving as I'd expect in that it works for
some things and not others. eg:

>>> eval("1+1")
2
>>> eval("print(123)")
123
>>> eval("for i in range(1,10): i")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1
    for i in range(1,10): i
      ^
SyntaxError: invalid syntax

Why did the 3rd one fail? Does it not handle complex expressions?

Thanks for any help